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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C., 20549

FORM 10-K

For the fiscal year ended December 31, 2015

OR

For the transition period from             to             

Commission File Number: 001-35020

INFUSYSTEM HOLDINGS, INC.

(Exact Name of Registrant as Specified in its Charter)

31700 Research Park Drive

Madison Heights, Michigan 48071

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, including Area Code:

(248) 291-1210

Securities Registered Pursuant to Section 12(b) of the Act:

Securities Registered Pursuant to Section 12(g) of the Act:

None

(Title of Class)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    YES  ¨    NO  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    YES  ¨    NO  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter periods as the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.    YES  x    NO  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    YES  x    NO  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (check one)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    YES  ¨    NO  x

The aggregate market value of the registrant’s voting equity held by non-affiliates of the registrant, computed by reference to the price at which the common stock was last sold as of the last business day of the registrant’s most recently completed second fiscal quarter, was $64,370,857. In determining the market value of the voting equity held by non-affiliates, securities of the registrant beneficially owned by directors and officers of the registrant have been excluded. This determination of affiliate status is not necessarily a conclusive determination for other purposes. The number of shares of the registrant’s common stock outstanding as of February 29, 2016 was 22,541,890.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of this registrant’s definitive proxy statement for its 2016 Annual Meeting of Stockholders to be filed with the SEC no later than 120 days after the end of the registrant’s fiscal year are incorporated herein by reference in Part III of this Annual Report on Form 10-K.

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References in this Annual Report on Form 10-K to “we”, “us”, or the “Company” are to InfuSystem Holdings, Inc. (“InfuSystem”) and our wholly owned subsidiaries.

Cautionary Statement About Forward-Looking Statements

Certain statements contained in this Annual Report on Form 10-K are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The words “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “should,” “plan,” “expect,” “strategy,” “future,” “likely,” variations of such words, and other similar expressions, as they relate to the Company, are intended to identify forward-looking statements. However, the absence of these words or similar expressions does not mean that a statement is not forward-looking. In connection with the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995, the Company is identifying certain factors that could cause actual results to differ, perhaps materially, from those indicated by these forward-looking statements. InfuSystem does not intend, and does not undertake any obligation to update any forward looking statement to reflect future events or circumstances after the date of such statements. Important factors that could cause our actual results and financial condition to differ materially from the forward-looking statements include, without limitation, those described in “Risk Factors” and elsewhere in this Annual Report on Form 10-K, and the following:

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These risks are not exhaustive. Other sections of this Annual Report on Form 10-K include additional factors which could adversely impact our business and financial performance. Moreover, we operate in a very competitive and changing environment. New risk factors emerge from time to time and it is not possible for us to predict all risk factors, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements. All forward-looking statements made in this Annual Report on Form 10-K speak only as of the date of this report. We do not intend, and do not undertake any obligation, to update any forward-looking statements to reflect future events or circumstances after the date of such statements, except as required by law.

You should not rely upon forward-looking statements as predictions of future events. Our actual results and financial condition may differ materially from those indicated in the forward-looking statements. We qualify all of our forward-looking statements by these cautionary statements. Although we believe that the expectations reflected in the forward looking-statements are reasonable, we cannot guarantee future results, levels of activity, performance or achievements. Therefore you should not rely on any of the forward-looking statements. In addition, with respect to all of our forward-looking statements, we claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995.

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PART I

Background

InfuSystem Holdings, Inc. (“InfuSystem”) is a Delaware corporation, formed in 2005. It operates through operating subsidiaries, including InfuSystem Holdings USA, Inc., a Delaware corporation (“Holdings”), InfuSystem, Inc., a California corporation (“ISI”), First Biomedical, Inc., a Kansas corporation (“First Biomedical”) and IFC, LLC, a Delaware limited liability company (“IFC”).

Business Concept and Strategy

We are a leading provider of infusion pumps and related products and services for patients in the home, oncology clinics, ambulatory surgery centers, and other sites of care from five locations in the United States and Canada. We provide our products and services to hospitals, oncology practices and facilities and other alternate site health care providers. Headquartered in Madison Heights, Michigan, we deliver local, field-based customer support, and also operate pump service and repair Centers of Excellence in Michigan, Kansas, California, Texas, Georgia and Ontario, Canada. ISI is accredited by the Community Health Accreditation Program (“CHAP”) while First Biomedical is ISO certified.

Our core service is to supply electronic ambulatory infusion pumps and associated disposable supply kits to oncology clinics, infusion clinics and hospital outpatient chemotherapy clinics to be utilized in the treatment of a variety of cancers including colorectal cancer, pain management and other disease states (“Oncology Business”). Colorectal cancer is the third most prevalent form of cancer in the United States, according to the American Cancer Society, and the standard of care for the treatment of colorectal cancer relies upon continuous chemotherapy infusions delivered via ambulatory infusion pumps.

In addition, we sell or rent new and pre-owned pole mounted and ambulatory infusion pumps to, and provide biomedical recertification, maintenance and repair services for oncology practices as well as other alternate site settings including home care and home infusion providers, skilled nursing facilities, pain centers and others. We also provide these products and services to customers in the hospital market.

We purchase new and pre-owned pole mounted and ambulatory infusion pumps from a variety of sources on a non-exclusive basis. We repair, refurbish and provide biomedical certification for the devices as needed. The pumps are then available for sale, rental or to be used within our ambulatory infusion pump management service.

One aspect of our business strategy is to expand into treatment of other cancers. In 2015, our Oncology Business approximated 72% of our total revenues. In 2015, we generated approximately 49% of our total revenues from treatments for colorectal cancer and 23% of our revenues from treatments for non-colorectal disease states. There are a number of approved treatment protocols for pancreatic, head and neck, esophageal and other cancers, as well as other disease states which present opportunities for growth. There are also a number of other drugs currently approved by the U.S. Food and Drug Administration (the “FDA”), as well as agents in the pharmaceutical development pipeline, which we believe could potentially be used with continuous infusion protocols for the treatment of diseases other than colorectal cancer. Additional drugs or protocols currently in clinical trials may also obtain regulatory approval over the next several years. If these new drugs or protocols obtain regulatory approval for use with continuous infusion protocols, we expect the pharmaceutical companies to focus their sales and marketing efforts on promoting the new drugs and protocols to physicians.

Another aspect of our business is to seek opportunities to leverage our extensive billing capabilities, pump resources and networks of oncology practices and insurers. This leverage may take the form of new products and/or services, strategic alliances, joint ventures and/or acquisitions. One of these is providing our ambulatory pumps, products, and services in the area of post-surgical peripheral nerve block. With regard to acquisitions, we

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believe there are additional opportunities, beyond our acquisition of Ciscura Holding Company, Inc., and its subsidiaries (“Ciscura”) that was made in April 2015, to acquire smaller, regional competitors, in whole or part that perform similar services to us but do not have the national market access, network of third party payor contracts or operating economies of scale that we currently enjoy. We also plan to leverage our extensive networks of oncology practices and insurers by distributing complementary products, including pain management and smart pumps, and introducing key new information technology based services such as BlockPain Dashboard^TM, EXPRESS^TM, InfuBus^TM or InfuConnect^TM, InfuTrack^TM, and PumpPortal^TM.

We face the risk that other competitors can provide the same services as we provide. That risk is currently mitigated and barriers to entry are created by our (i) growing number of third party payor networks under contract, which exceeded 340 third party payor networks for the fiscal year ended December 31, 2015; (ii) economies of scale, which allow for predictable reimbursement and less costly purchase and management of the pumps, respectively; (iii) established, long standing relationships as a provider of pumps to outpatient oncology practices in the U.S.; (iv) established national presence with Accountable Care Organizations (“ACOs”); (v) pump fleet of ambulatory and large volume infusion pumps for rent and for sale, which may allow us to be more responsive to the needs of physicians, outpatient oncology practices, hospitals, outpatient surgery centers, homecare practices, patient rehabilitation centers and patients than a new market entrant; (vi) six geographic locations in the U.S. and Canada that allow for same day or next day delivery of pumps with plans for a seventh in the northeastern U.S.; and (vii) pump repair and service capabilities at all of these facilities. We do not perform any research and development on pumps, but we have made, and continue to make, significant investments in developing our information technology as described below.

Management is intent on extending its considerable breadth of payor networks under contract as patients move into different insurance coverages, including Medicaid and Insurance Marketplace products. In some cases, this may slightly reduce our aggregate billed revenues payment rate but result in an overall increase in collected revenues, as shown by a reduction in bad debt expense. Consequently, we are increasingly focused on net collected revenues less bad debt.

In the midst of changes in the healthcare arena, we believe that we will support our overall business strategy discussed above by (i) focusing on supporting recurring revenues by increasing our pump fleet; (ii) improving liquidity and strengthening the balance sheet by keeping debt levels comparable to our operations; (iii) improving internal operational efficiencies; (iv) increasing our product and services offerings; (v) enhancing our technology offerings to the patients and providers of care; and (vi) investigating synergistic acquisitions.

Continuous Infusion Therapy

Continuous infusion of chemotherapy involves the gradual administration of a drug via a small, lightweight, portable infusion pump over a prolonged period of time. A cancer patient can receive his or her medicine anywhere from one to 30 days per month depending on the chemotherapy regimen that is most appropriate to that individual’s health status and disease state. This may be followed by periods of rest and then repeated cycles with treatment goals of progression-free disease survival. This drug administration method has replaced intravenous push or bolus administration in specific circumstances. The advantages of slow continuous low doses of certain drugs are well documented. Clinical studies support the use of continuous infusion chemotherapy for decreased toxicity without loss of anti-tumor efficacy. The 2015 National Comprehensive Cancer Network (“NCCN”) Guidelines recommend the use of continuous infusion for treatment of numerous cancer diagnoses. We believe that the growth of continuous infusion therapy is driven by three factors: evidence of improved clinical outcomes; lower toxicity and side effects; and a favorable reimbursement environment.

Significant recent progress has been made in the treatment of colorectal cancer due to advances in surgery, radiotherapy and chemotherapy. In the late 1990s, medical researchers discovered that the delivery method of the drug (or schedule) was a key component to drug availability, efficacy and tolerability. Schedule dependent anti-tumor activity and toxicity has resulted in continuous infusion 5-Fluorouracil being adopted as the standard of care. In 2000, the FDA approved Camptosar (the trade name for the generic chemotherapy drug Irinotecan), a drug developed by Pfizer, for first-line therapy in combination with 5-Fluorouracil for the treatment of colorectal

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cancer. In 2002, the FDA approved Eloxatin (the trade name for the generic chemotherapy drug Oxaliplatin), a drug developed by Sanofi-Aventis, for use in combination with continuous infusion 5-Fluorouracil for the treatment of colorectal cancer. FOLFIRI, the chemotherapy protocol which includes Camptosar in combination with continuous infusion 5-Fluorouracil and the drug Leucovorin, and FOLFOX, the chemotherapy protocol which includes Eloxatin in combination with continuous infusion 5-Fluorouracil and Leucovorin, have resulted in significantly improved overall survival rates for colorectal cancer patients at various stages of the disease state. We believe that Sanofi-Aventis and Pfizer have each dedicated significant resources to educating physicians and promoting the use of FOLFOX and FOLFIRI. Simultaneously, the NCCN has established these regimens as the standards of care for the treatment of colorectal cancer.

The use of continuous infusion has been demonstrated to decrease or alter the toxicity of a number of cytotoxic, or cell killing agents. Higher doses of drugs can be infused over longer periods of time, leading to improved tolerance and decreased toxicity. For example, the cardiotoxicity (heart muscle damage) of the chemotherapy drug Doxorubicin is decreased by schedules of administration according to The Chemotherapy Source Book by Michael C. Perry. Nausea, vomiting, diarrhea and decreased white blood cell and platelet counts are all affected by duration of delivery. Continuous infusion can lead to improved tolerance and patient comfort while enhancing the patient’s ability to remain on the chemotherapy regimen. Additionally, the lower toxicity profile and resulting reduction in side effects enables patients undergoing continuous infusion therapy to continue a relatively normal lifestyle, which may include continuing to work, going shopping, and caring for family members. We believe that the partnering of physician management and patient autonomy provide for the highest quality of care with the greatest patient satisfaction.

We believe that oncology practices have a heightened sensitivity to whether and how much they are reimbursed for services. Simultaneously, the Center for Medicare and Medicaid Services (“CMS”) and private insurers are increasingly focusing on evidence-based medicine to inform their reimbursement decisions — that is, aligning reimbursement with clinical outcomes and adherence to standards of care. Continuous infusion therapy is a main component of the standard of care for certain cancer types because clinical evidence demonstrates superior outcomes. Payors recognize this and it is reflected in favorable reimbursement for clinical services related to the delivery of this care.

Services

Our core service is our Oncology Business. After providing ambulatory pumps to oncology offices, infusion clinics and hospital and outpatient chemotherapy clinics, we then directly bill and collect payment from payors and patients for the use of these pumps. At any given time, our pumps are in the possession of these facilities, on a patient, in transport, or in our facilities for cleaning, calibration and storage as reserves for increased demand.

After a physician determines that a patient is eligible for ambulatory infusion pump therapy, the physician arranges for the patient to receive an infusion pump and provides the necessary chemotherapy drugs. The physician and nursing staff train the patient in the use of the pump and initiate service. The physician bills the payors, which include Medicare, Medicaid, third party payor companies or patients for the physician’s professional services associated with initiating and supervising the infusion pump administration, as well as the supply of drugs. We directly bill (i) payors and (ii) patients for copays and deductibles, for the use of the pump and related disposable supplies. Billing to payors requires coordination with patients and physicians who initiate the service, as physicians’ offices must provide us with appropriate documentation (patient’s insurance information, physician’s order, an acknowledgement of benefits that shows receipt of equipment by the patient, and, in some cases, physician’s progress notes) in order for us to submit a bill to the payors. We do provide assistance to those that cannot afford our pumps via our financial hardship program — a program that usually matches what our physician practices provide as long as the uninsured patients meet certain criteria. This billing process is handled from our Madison Heights, Michigan location.

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In addition to providing high quality and convenient care, we believe that our business offers significant economic benefits for patients, providers and payors.

Other services we offer include the rental, sale or leasing of pole mounted and ambulatory infusion pumps to oncology practices, hospitals and other clinical settings. As of December 31, 2015, our rental fleet of pole mounted and ambulatory pumps had a historical cost of $53.7 million, up from $43.2 million from the end of 2014, and included approximately 70 makes and models of equipment dedicated to our rental services. These pumps are available for daily, weekly, monthly or annual rental periods. As of December 31, 2015 and 2014, we had a fleet of new and used pole mounted and ambulatory pumps with a historical cost of $2.3 million for sale or lease.

In addition to sales, rental and leasing services, we also provide biomedical maintenance, repair and certification services for the devices we offer as well as for devices owned by customers but not acquired from us. We operate pump service and repair Centers of Excellence from all of our locations across the United States and Canada and employ a staff of highly trained technicians to provide these services. Our main Center of Excellence for service is our Lenexa, Kansas facility.

We also offer electronic ambulatory infusion pumps for post-operative pain management using our pumps along with a numbing agent and a continuous nerve block catheter — continuous peripheral nerve block (“CPNB”). Using CPNB for the management of post-operative pain, which usually lasts two to three days after surgery, can result in reduced pain for the patient, increased satisfaction scores for the surgical center or hospital, and reduced need for post-operative medication.

Information Technology

The Company’s first Chief Information Officer was hired in 2013 to transform the Company’s Information Technology (“IT”) platform and enhance business processes beginning in 2014. IT refocused on not only supporting our internal IT needs to reduce our platforms and redundant systems from two IT platforms into a consolidated solution but also in supporting electronic medical record technology (“EMR”) to be used by medical facilities using the Company’s infusion pumps and services via our solutions such as EXPRESS^TM and InfuConnect^TM . This focus has enabled current billing information to be transferred to the Company from these facilities electronically and automatically, bypassing the current methods of mail, email, and/or facsimile. We expect that this new focus will continue to strengthen our relationships with our existing customers and result in additional investment in intangible software assets by the Company. Additional IT customer focused solutions are PumpPortal^TM, InfuTrack^TM (“Pump Fleet Lifecycle Management Solutions”) and BlockPain Dashboard^TM. Our continued focus on IT efforts has resulted in the following new products:

EXPRESS^TM, powered by InfuBus^TM data integration platform, provides for paperless delivery of the appropriate information for InfuSystem to bill payors:

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Pump Fleet Lifecycle Management Solutions, which provide interfaces for customers to keep their pump fleets right-sized and in good condition by:

BlockPain Dashboard^TM, which supports our new product solutions in providing our ambulatory pumps, products, and services in the area of post-surgical peripheral nerve block by:

In 2015 and 2014, the Company capitalized in excess of $5.6 million and $3.4 million, respectively, into IT, with specific focus as discussed above, plus other internal operational efficiencies and new products and support.

Relationships with Physician Offices

As of December 31, 2015, we had business relationships with clinical oncologists in excess of 1,700 outpatient oncology clinics. Although this represents a substantial number of the oncologists in the United States, we believe we can continue to expand our network to further penetrate the oncology market. Based on our retention rates and the positive results of our professional customer satisfaction research, we believe our relationships with physician offices are strong.

We believe that, in general, we do not compete directly with hospitals and physician offices to treat patients. Rather, by providing products and services to hospitals and physician offices and other care facilities and providers, we believe that we assist other providers in meeting increasing patient demand and managing institutional constraints on capital and manpower due to the nature of limited resources in hospitals and physician offices.

Physician practices in the oncology field are consolidating — similar to healthcare practices in general. However, as of December 31, 2015, we had gained more practices than we had lost due to consolidation. We expect this trend to continue in the near future.

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Employees

As of December 31, 2015, we had 261 employees, including 242 full-time employees and 19 part-time or contract employees. None of our employees are unionized.

Material Suppliers

We supply a wide variety of pumps and associated equipment, as well as disposables and ancillary supplies. The majority of our pumps are electronic infusion pumps purchased from the following manufacturers, each of which supplies more than 10% of the ambulatory pumps purchased by us: Smiths Medical, Inc. and WalkMed Infusion, LLC. We have supply agreements in place with these suppliers. Certain “spot” purchases are made on the open market subject to individual negotiation.

Seasonality

Our business rental activity is not subject to seasonality. Revenues from this activity, net of bad debt, may be seasonal due to the impact of co-pays and deductibles for patients’ insurance that traditionally reset each January. This has been further impacted by changes in the insurance industry as it responds to increased government regulation. Also, rental customers tend to make buy versus rent decisions late in the year as customer capital budgets are being finalized, impacting sales revenue in the second half of the year, predominantly in the fourth quarter. Furthermore, as the Company’s liquidity has improved, opportunistic pump purchases are made from time to time. These opportunistic pump purchases also allow for opportunistic pump sales, which could be material. The timing of such purchases and sales vary within the course of a year.

Environmental Laws

We are required to comply with applicable federal, state and local environmental laws regulating the disposal of cleaning agents used in the process of cleaning our ambulatory infusion pumps, as well as the disposal of sharps and blood products used in connection with the pumps. We do not believe that compliance with such laws has a material effect on our business.

Significant Customers

We have sought to establish contracts with as many third party payor organizations as commercially practicable, in an effort to ensure that reimbursement is not a significant obstacle for providers who recommend continuous infusion therapy and wish to utilize our services. A third party payor organization is a health care payor or a group of medical services payors that contracts to provide a wide variety of health care services to enrolled members through participating providers such as us. A payor is any entity that pays on behalf of a member patient.

As of December 31, 2015, we had contracts with more than 340 third party payor networks under contract. Material terms of contracts with third party payor organizations are typically a set fee or rate, or a discount from billed charges for equipment provided. The majority of these contracts generally provide for a term of one year, with automatic one-year renewals, unless we or the contracted payor elect not to renew. For 2015 and 2014, our largest contracted payor was Medicare, which accounted for approximately 32% and 30% of our net revenue from our Oncology Business for 2015 and 2014, respectively, and approximately 19% of our total revenues for both 2015 and 2014. Medicare represented 20% and 18% of our consolidated accounts receivable, net for the years ended December 31, 2015 and 2014, respectively. For 2015 and 2014, our next largest contracted payor, was a national association comprised of multiple members, which, in the aggregate, accounted for approximately 18% of our net revenue from our Oncology Business for both 2015 and 2014, and approximately 12% of our total revenues for both 2015 and 2014. This same contracted payor represented 27% and 26% of our consolidated accounts receivable, net for the years ended December 31, 2015 and 2014, respectively. We also contract with various other third party payor organizations, Medicaid, commercial Medicare replacement plans, self-insured plans and numerous other insurance carriers. Other than the payors noted above, no other single payor represented more than 9% of third-party payor net revenue.

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By 2016, CMS is required by regulation to begin the process of fully implementing some form of competitive bidding. On October 31, 2014, CMS released a final rule entitled, “End-Stage Renal Disease Prospective Payment System, Quality Incentive Program, and Durable Medical Equipment, Prosthetics, Orthotics, and Supplies” (“Final Rule”). This Final Rule was published in its entirety in the Federal Register on November 6, 2014 and finalizes several provisions related to durable medical equipment, prosthetics, orthotics and supplies (“DMEPOS”) including:

In December 2015, CMS released the SPAs for 2016. These SPAs confirmed our interpretation of the Final Rule. Coupling the impact of competitive bidding with the impact of the addition of new payor networks associated with the Patient Protection and Affordable Care Act (the “ACA”) is complicated. Medicare Advantage plans managed by commercial payors and more Medicaid plans are now tied to CMS pricing. Increases in networks under contract have now increased our net collected revenues as more revenues are the responsibility of a third-party payor, as opposed to a patient which traditionally is associated with a higher rate of bad debt.

Based on the mix and billing levels of revenues and fee schedules for the fiscal year ended December 31, 2015, we estimate when applying the Final Rule and the 2016 SPA’s that our revenues could be reduced by up to approximately $3.8 million in 2016 and an additional $1.2 million in 2017, in each case, as compared to our revenue in 2015. These reductions are expected to be offset by an increase in revenues related to our increase in networks under contract by $1.5 million in 2016 and management believes further increases and improvements in its networks under contract can improve revenues in 2017, as well. The Company believes that its focus on growth in recurring revenues, improving its commercial contracts, revenues from new products and services, improvements in IT, and other operational improvements could also potentially offset these reductions.

Certain factors such as revenue mix, competitive responses, commercial and Medicaid contracts tied to CMS, and other potential factors, could impact these estimates. As a result, there can be no assurances as to the actual impact of the Final Rule and the 2016 SPA’s in 2016 and 2017, which could negatively impact the Company’s market share, negatively impact business with the Company’s customers and other payors and significantly reduce revenues, earnings and cash flow beyond what is mentioned above.

Competitors

We believe that our competition is primarily composed of regional durable medical equipment (“DME”) providers, hospital-owned DME providers, physician providers and home care infusion providers. An estimate of the number of competitors is not known or reasonably available, due to the wide variety in type and size of the market participants described below. We are not aware of any industry reports with respect to the competitive market described below. The description of market segments and business activities within those market segments is based on our experiences in the industry.

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Regulation of Our Business

Our business is subject to certain regulations. Specifically, as a Medicare supplier of DME and related supplies, we must comply with supplier standards established by CMS regulating Medicare suppliers of DMEPOS (“DMEPOS Supplier Standards”). The DMEPOS Supplier Standards consist of 30 requirements that must be met in order for a DMEPOS supplier to be eligible to receive payment for a Medicare-covered item. Some of the more significant DMEPOS Supplier Standards require us to (i) advise Medicare beneficiaries of their option to purchase certain equipment, (ii) honor all warranties under state law and not charge Medicare beneficiaries for the repair or replacement of equipment or for services covered under warranty, (iii) permit CMS agents to conduct on-site inspections to ascertain compliance with the DMEPOS Supplier Standards, (iv) maintain liability insurance in prescribed amounts, (v) refrain from contacting Medicare beneficiaries by telephone, except in certain limited circumstances, (vi) answer questions and respond to complaints of beneficiaries regarding the supplied equipment, (vii) disclose the DMEPOS Supplier Standards to each Medicare beneficiary to whom we supply equipment, (viii) maintain a complaint resolution procedure and record certain information regarding each complaint, (ix) maintain accreditation from a CMS approved accreditation organization, and (x) meet certain specified surety bond requirements.

We are also subject to the provisions of the Health Insurance Portability and Accountability Act of 1996 (“HIPAA”), which are designed to protect the security and confidentiality of certain patient health information. Under HIPAA, we must provide patients access to certain records and must notify patients of our use of personal medical information and patient privacy rights. Moreover, HIPAA sets limits on how we may use individually identifiable health information and prohibits the use of patient information for marketing purposes. The adoption of the American Recovery and Reinvestment Act of 2009 (“ARRA”) includes a new breach notification requirement that applies to breaches of unsecured health information occurring on or after September 23, 2009. We are subject to regulations in the various states in which we operate. We believe we are in material compliance with all such regulations.

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The health care industry is undergoing fundamental changes resulting from political, economic and regulatory influences. In 2010, the ACA was enacted into law to reform the United States health care system and implemented in 2013. The legislation was intended to expand access to health insurance coverage, improve quality and reduce costs over time. We believe the law has impacted and will continue to impact various aspects of our business operations, including payor mix as our Medicaid and patient pay percentages increased in 2015 over 2014. However, it is unclear how the law will further impact reimbursement rates.

In addition, the ACA imposes a 2.3% excise tax on medical devices that applies to sales within the United States of a majority of our pump products that we purchase. This law imposes an excise tax on the first sale of medical devices by a manufacturer, producer, or importer equal to 2.3% of the sales price. This tax only applies directly to new pumps that we purchase from manufacturers. Taxable medical devices include any device as defined in Section 201(h) of the Federal Food, Drug, and Cosmetic Act intended for humans, with the exception of eyeglasses, contact lenses, hearing aids and any other device determined by the Secretary of Health and Human Services to be a type which is generally purchased by the general public at retail for individual use. On December 18, 2015, under the Consolidated Appropriations Act, 2016 (Pub. L. 114-113), this excise tax was given a two year moratorium on the medical device excise tax by Section 4191 of the Internal Revenue Code (the “Code”). Thus, the medical device excess tax does not apply to the sale of a taxable medical device by the manufacturer, producer, or importer of the device during the period beginning on January 1, 2016 and ending on December 31, 2017. Future legislation could have a material effect on our business, cash flows, financial condition and results of operations.

Recent Events in Our Business

CMS

On April 21, 2015 the CMS announced plans to recompete the supplier contracts awarded in Round 1 Recompete of the Medicare DMEPOS Competitive Bidding Program. CMS is required by law to recompete contracts under the DMEPOS Competitive Bidding Program at least once every three years. The Round 1 Recompete contract period for all product categories expires on December 31, 2016. The Round 1 2017 product categories do not include a category for external infusion pumps as in the previous Round 1 Recompete.

See the additional discussion above under Item 1 — Business — Significant Customers.

Credit Facility

On March 23, 2015, we and our direct and indirect subsidiaries entered into the credit agreement (the “Credit Agreement”) with JPMorgan Chase Bank, N.A., as lender (the “Lender”). The Credit Agreement consists of a $27.0 million Term Loan A, up to $8.0 million Term Loan B and a $10.0 million revolving credit facility (the “Revolver”), all of which mature on March 23, 2020 (collectively, the “Credit Facility”).

Under the terms of the Credit Agreement, principal payments equal to $1.0 million are due on Term Loan A on the last business day of each quarter beginning with the last business day of September 2015 and are due until the maturity date of the Credit Facility. Principal payments on Term Loan B are due on the last business day of each fiscal quarter beginning with the last business day of March 2016. The value of each principal payment due on Term Loan B shall be equal to 3.575% of the principal balance of Term Loan B as of the Term Loan B Draw Expiration Date for the first eight quarterly payments. Thereafter, the next 8 principal payments shall be equal to 4.475% of the principal balance of Term Loan B as of the Term Loan B Draw Expiration Date. The entire outstanding balance of the revolver shall be due at the maturity of the Credit Facility.

During the year ended December 31, 2015, we made optional pre-payments of $4.8 million on our Term Loan A, which we can apply against future mandatory payments. Prepayments of $1.9 million were applied to September 30, 2015 and December 31, 2015 Term Loan A principal payments. Remaining prepayments of $2.9 million are available towards 2016 future mandatory payments.

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Ciscura

On April 20, 2015 (the “Closing Date”), we closed on the acquisition of substantially all of the assets of Ciscura, a privately-held Southeastern regional provider of ambulatory infusion pumps and services to medical facilities based in Alpharetta, Georgia.

We acquired approximately 1,800 infusion pumps from Ciscura, its four person field sales team, as well as its facilities management personnel, which have become the foundation of the our new Southeast facility. With this new regional warehouse and service facility, we will be in close proximity to a number of our largest existing customers, in addition to new customers previously serviced by Ciscura, enabling same day service for equipment and supplies to much of the Southeast region.

The asset purchase agreement provided for an adjustment to the purchase price based on the final number of pumps acquired and the associated treatments, which were generated during the 90 day period post-closing from the approximately 100 medical facility relationships Ciscura had prior to the acquisition. The final total purchase price, which was based on the number of acquired pumps and associated treatments, was approximately $6.2 million.

On the Closing Date, we made an initial payment of $3.8 million, an additional payment of $2.1 million was made in September 2015 and a final payment of $0.3 million was made in November 2015. The associated integration and transaction costs expended in 2015 were $0.7 million.

Available Information

Our Internet address is www.infusystem.com. On this Web site, we post the following filings as soon as reasonably practicable after they are electronically filed with or furnished to the U.S. Securities and Exchange Commission (the “SEC”): our Annual Reports on Form 10-K; our Quarterly Reports on Form 10-Q; our Current Reports on Form 8-K; our proxy statements related to our annual stockholders’ meetings; and any amendments to those reports or statements. All such filings are available on our Web site free of charge. The charters of our audit, nominating and governance and compensation committees and our Code of Business Conduct and Ethics Policy are also available on our Web site and in print to any stockholder who requests them. The content on our Web site is not incorporated by reference into this Annual Report on Form 10-K unless expressly noted.

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An investment in our securities involves a high degree of risk. You should consider carefully all of the material risks described below, together with the other information contained in this Annual Report on Form 10-K. If any of the following events occur, our business, financial condition, results of operations and cash flows may be materially adversely affected.

RISK FACTORS RELATING TO OUR BUSINESS AND THE INDUSTRY IN WHICH WE OPERATE

Our business is substantially dependent on third-party reimbursement. Any change in the overall health care reimbursement system may adversely impact our business.

Our revenues are substantially dependent on third-party reimbursement. We are paid directly by private insurers and governmental agencies, often on a fixed fee basis, for the use of continuous infusion equipment and related disposable supplies provided to patients. If the average fees allowable by private insurers or governmental agencies were reduced, the negative impact on revenues could have a material effect on our business, financial condition, results of operations and cash flows. Also, if amounts owed to us by patients and insurers are reduced or not paid on a timely basis, we may be required to increase our bad debt expense and/or decrease our revenues.

Changes in the health care reimbursement system often create financial incentives and disincentives that encourage or discourage the use of a particular type of product, therapy or clinical procedure. Such changes may be impacted by the growth in ACOs, reduction of providers by payors, the use of lower cost rental networks and other factors. Market acceptance of continuous infusion therapy may be adversely affected by changes or trends within the health care reimbursement system. Changes to the health care reimbursement system that favor other technologies or treatment regimens that reduce reimbursements to providers or treatment facilities, including increasing competitive pressures from home health care and other companies that use our services, may adversely affect our ability to market our services profitably. Overall, such dependency and potential changes could materially and adversely affect our business, financial condition, results of operations and cash flows.

On April 21, 2015, the CMS announced plans to recompete the supplier contracts awarded in Round 1 Recompete of the Medicare DMEPOS Competitive Bidding Program. CMS is required by law to recompete contracts under the DMEPOS Competitive Bidding Program at least once every three years. The Round 1 Recompete contract period for all product categories expires on December 31, 2016. The Round 1 2017 product categories do not include a category for external infusion pumps as in the previous Round 1 Recompete. There is no assurance that this exclusion will remain in the future and there is not currently sufficient information available to determine how this development may impact our future revenues and net income.

For additional information pertaining to CMS, refer to Item 1 — Business — Significant Customers and also Recent Events in Our Business.

The loss of a relationship with one or more third party payors could negatively impact our business.

Our contracts for reimbursement with third party payors are often for a term of one year, with automatic one-year renewals, unless we or the contracted payor elect not to renew. These evergreen contracts are subject to termination upon written notice. One or more terminations could have a material and adverse effect on our business, financial condition, results of operations and cash flows.

Any federal government shutdown may adversely impact our business.

Our revenues are dependent on private insurers and governmental agencies. In the absence of any bipartisan agreement in the federal government with respect to payments from governmental agencies, our revenues could be reduced. In addition, any federal government shutdown could also have a material and adverse impact on our business, financial condition, results of operations and cash flows.

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Our business has and may continue to be adversely impacted by the U.S. federal government’s sequestration.

On March 1, 2013, most agencies of the U.S. federal government automatically reduced their budgets according to an agreement made by Congress in 2012 known as “sequestration”. Originally devised as an incentive to force Congressional agreement on budget issues, the sequestration order was approved on March 1, 2013 by the President of the United States. Beginning in 2013, we were impacted by the sequestration order, which effects Medicare payments. For the year ended December 31, 2015, the impact on our revenue was $0.4 million, which was consistent with the same twelve month period in 2014. As of the date of this report, it is our understanding that the mandatory payment reduction of 2% will continue through March 31, 2016. We also believe that the cuts will likely continue until definitive action is taken by the U.S federal government on this issue.

Payor concentration may adversely impact our business.

A substantial portion of our contracted payor revenues have been dependent on one payor or a limited concentration of payors. In particular, Medicare represented approximately 32% and 30% of our net revenue from our Oncology Business for 2015 and 2014, respectively, or approximately 19% of our total revenues for both 2015 and 2014. Medicare represented 20% and 18% of our consolidated accounts receivable, net for the years ended December 31, 2015 and 2014, respectively. For 2015 and 2014, our next largest contracted payor was a national association comprised of multiple members, which, in the aggregate accounted for approximately 18% of our net revenue for our Oncology Business for both 2015 and 2014, and approximately 12% of our total revenues for both 2015 and 2014. This same contracted payor represented 27% and 26% of our consolidated accounts receivable, net for the years ended December 31, 2015 and 2014, respectively. We also contract with various other third party payor organizations, Medicaid, commercial Medicare replacement plans, self-insured plans and numerous other insurance carriers. Other than the payors noted above, no other single payor represented more than 9% of third-party payor net revenue. To the extent such dependency continues, significant fluctuations in revenues, results of operations and liquidity could arise if Medicare or any other significant contracted payor reduces its reimbursement for the services we provide.

Our billing process is dependent on meeting payor claims processing guidelines which are subject to change at the discretion of the payors. Such changes would materially impact our ability to bill and the timing of such billings, which could materially and adversely impact our revenues, bad debt expense and cash flows, which impact would be even greater if such changes are made by one of our larger payors.

The continued consolidation of physician practices, outpatient infusion clinics, oncology clinics, homecare providers and hospitals increases the concentration of decision makers whom either choose to use our ambulatory electronic pumps within our Oncology Business or directly rent, lease or purchase pumps or supplies directly from us.

While we make every effort to benefit from such concentration, such concentration could materially and adversely affect our business, financial condition, results of operations and cash flows.

Increased focus on early detection and diagnostics may adversely affect our business.

An increased focus on lowering health care spending via improved diagnostic testing (i.e., defensive medicine) and patient monitoring could materially and negatively affect our business. A large portion of our ambulatory infusion pumps are dedicated to a specific form of cancer (i.e., colorectal). As a result of rising health care costs, there may be a demand for more cost-effective approaches to disease management, specifically for colorectal cancer, as well as for emphasis on screening and accurate diagnostic testing to facilitate early detection of potentially costly, severe afflictions. Any change in the approach to treatment of colorectal cancer could have a material and adverse impact on our business, financial condition, results of operations and cash flows.

If future clinical studies demonstrate that oral medications or other therapies that do not use our electronic ambulatory pumps are at least as effective as continuous infusion therapy, our business could be adversely affected.

Numerous ongoing clinical trials are currently evaluating and comparing the therapeutic benefits of current continuous infusion-based regimens with various oral medication regimens. If these clinical trials demonstrate

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that oral medications provide equal or greater therapeutic benefits and/or demonstrate reduced side effects compared to prior oral medication regimens, our revenues and overall business could be materially and adversely affected. Additionally, if new oral medications or other therapies that do not utilize our ambulatory electronic pumps are introduced to the market that are superior to existing oral therapies, physicians’ willingness to prescribe continuous infusion-based regimens could decline, which would materially and adversely affect our business, financial condition, results of operations and cash flows.

We are dependent on our Medicare Supplier Number.

We are required to have a Medicare Supplier Number in order to bill Medicare for services provided to Medicare patients. Furthermore, all third party and Medicaid contracts require us to have a Medicare Supplier Number. We are required to comply with Medicare DMEPOS Supplier Standards in order to maintain such number. If we are unable to comply with the relevant standards, we could lose our Medicare Supplier Number. The loss of such identification number for any reason would prevent us from billing Medicare for patients who rely on Medicare to pay their medical expenses and, as a result, we would experience a decrease in our revenues. Without such a number, we would be unable to continue our various third party and Medicaid contracts. A significant portion of our revenues are dependent upon our Medicare Supplier Number, the loss of which would materially and adversely affect our business, financial condition, results of operations and cash flows.

The CMS requires that all DME providers must be accredited by a CMS approved accreditation organization. On February 17, 2009, we initially received accreditation from the CHAP, and we have remained accredited to date. If we lost our accredited status, our business, financial condition, revenues and results of operations would be materially and adversely affected.

Our success is impacted by the availability of the chemotherapy drugs that are used in our continuous infusion pump systems.

We primarily derive our revenues from the rental of ambulatory infusion pumps to oncology patients through physicians’ offices and chemotherapy clinics. A shortage in the availability of chemotherapy drugs that are used in the continuous infusion pump system, which has occurred in the past, could have a material and adverse effect on our business, financial condition, results of operations and cash flows.

The impact of United States health care reform legislation on us remains uncertain.

The ACA has perpetuated the development of alternative provider payment models by CMS and the major national commercial payors. These payment models do not replace the current fee-for-service models nor replace current payor contracts, but rather provide additional financial incentives to certain “accountable” providers to improve quality and lower cost. The implications for the Company will come from the provider networks that are forming in order to integrate and coordinate care under these alternative models with CMS and the commercial payors. These provider networks include ACOs, patient-centered primary care medical homes, specialty medical homes, networks accepting bundled payment programs, and other “performance” networks that contract with CMS and commercial payors under alternative payment models that financially reward improved quality and lower medical cost. The relationship between us and our provider practices and facilities that are participating in these provider networks under alternative payment models will depend on (i) the extent to which these provider networks give priority to the medical cost associated with our DME services and (ii) whether our services are seen as part of a care delivery model that delivers higher value — higher quality at a lower cost.

Our failure to perform under these alternative payment models, or under similar models or conditions introduced by future legislation, could have a material adverse impact on our business, financial condition, results of operations and cash flows.

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We rely on independent suppliers for our products. Any delay or disruption in the supply of products, particularly our supply of electronic ambulatory pumps, may negatively impact our operations.

Our infusion pumps are obtained from outside vendors. The majority of our new pumps are electronic infusion pumps which are supplied to us by two major suppliers: Smiths Medical, Inc. and WalkMed Infusion, LLC. The loss or disruption of our relationships with outside vendors, including pump, parts, or supply recall or pump end of life announcements, could subject us to substantial delays in the delivery or service of pumps to customers. Significant delays in the delivery or service of pumps could result in possible cancellation of orders and the loss of customers. Our inability to provide pumps to meet delivery schedules could have a material adverse effect on our reputation in the industry, as well as on our business, financial condition, results of operations and cash flows.

We face periodic reviews and billing audits from governmental and private payors and these audits could have adverse results that may negatively impact our business.

As a result of our participation in the Medicare and Medicaid programs, we are subject to various governmental reviews and audits to verify our compliance with these programs and applicable laws and regulations. We also are subject to audits under various government programs in which third party firms engaged by CMS conduct extensive reviews of claims data and medical and other records to identify potential improper payments under the Medicare program. Private pay sources also reserve the right to conduct audits. If billing errors are identified in the sample of reviewed claims, the billing error can be extrapolated to all claims filed which could result in a larger overpayment than originally identified in the sample of reviewed claims. Our costs to respond to and defend reviews and audits may be significant and could have a material adverse effect on our business, financial condition, results of operations and cash flows. Moreover, an adverse review or audit could result in:

Any one of these results could have a material adverse effect on our business, financial condition, results of operations and cash flows.

We do not collect sales or consumption taxes in some jurisdictions.

Our core services are exempt from sales tax or its equivalent in many states. However, there are a several states that consider pump rentals, sales and services taxable regardless of method of payment. We are collecting sales tax or its equivalent in several jurisdictions. A successful assertion by one or more states or localities requiring us to collect taxes where we currently do not, could result in substantial tax liabilities, including for past sales, as well as penalties and interest.

If we are unsuccessful in our efforts to implement and support information technology improvements or respond to technological changes, our growth, prospects and results of operations could be adversely affected.

To remain competitive, we must continue to enhance and improve the functionality and features of our technology solutions and services. We have implemented a service to support EMR technology with some of our outpatient infusion practices that enables billing information to be transferred between us and medical facilities electronically and automatically, thus eliminating the current use of mail, email and/or faxes. We have also implemented a web portal that supports our rental and service customers. If these efforts cease to be successful, our reputation and ability to attract and retain customers and contributors will be adversely affected.

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Furthermore, we are likely to incur expenses in connection with continuously updating and improving our technology infrastructure and services. Without such improvements, our operations might suffer from unanticipated system disruptions, slow application performance or unreliable service levels, any of which could negatively affect our reputation and ability to attract and retain customers and contributors. We may face significant delays in introducing new services, products and enhancements.

If competitors introduce new products and services using new technologies or if new industry standards and practices emerge, our existing technology and systems may become obsolete or less competitive, and our business may be harmed. In addition, the expansion and improvement of our systems and infrastructure will require us to commit substantial financial, operational and technical resources, with no assurance that our business will improve.

All of these factors could have a material adverse impact on our business, financial condition, results of operations and cash flows.

Technological interruptions or the efficiency of our website and technology solutions would damage our reputation and brand and adversely affect our results of operations.

The satisfactory performance, security, reliability and availability of our network infrastructure are critical to our reputation, our ability to attract and retain customers and our ability to maintain adequate customer service levels. Any system interruptions, outside intrusions, or security breaches could result in negative publicity, damage our reputation and brand or adversely affect our results of operations. We may experience temporary system interruptions for a variety of reasons, including security breaches and other security incidents, viruses, telecommunication and other network failures, power failures, software errors or data corruption. We rely upon third-party service providers, such as co-location and cloud service providers, for our data centers and application hosting, and we are dependent on these third parties to provide continuous power, cooling, internet connectivity and physical security for our servers. In the event that these third-party providers experience any interruption in operations or cease business for any reason, or if we are unable to agree on satisfactory terms for continued hosting relationships, our business could be harmed and we could be forced to enter into a relationship with other service providers or assume hosting responsibilities ourselves. Although we operate two data centers in an active/standby configuration for geographic and vendor redundancy and even though we maintain a third disaster recovery facility to back up our content collection, a system disruption at the active data center could result in a noticeable disruption of our services. Even a disruption as brief as a few minutes could have a negative impact on marketplace activities and could therefore result in a loss of revenues. Because some of the causes of system interruptions may be outside of our control, we may not be able to remedy such interruptions in a timely manner, or at all.

All of these factors could have a material adverse impact on our business, financial condition, results of operations and cash flows.

Our failure to maintain controls and processes over billing and collecting could have a significant negative impact on our Consolidated Financial Statements.

The collection of accounts receivable is a significant challenge, and requires constant focus and involvement by management and ongoing enhancements to information systems and billing center operating procedures. If we are unable to properly bill and collect our accounts receivable, our results could be materially and adversely affected. While management believes that controls and processes are satisfactory, there can be no assurance that accounts receivable collectability will remain at current levels.

State licensure laws for DME suppliers are subject to change. If we fail to comply with any state laws, we will be unable to operate as a DME supplier in such state and our business operations will be adversely affected.

As a DME supplier operating in all 50 states, we are subject to each state’s licensure laws regulating DME suppliers. State licensure laws for DME suppliers are subject to change and we must ensure that we are

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continually in compliance with the laws of all 50 states. In the event that we fail to comply with any state’s laws governing the licensing of DME suppliers, we will be unable to operate as a DME supplier in such state until we regain compliance. We may also be subject to certain fines and/or penalties and our business operations could be materially and adversely affected.

Our allowance for doubtful accounts may not be adequate to cover actual losses.

Our third-party payor contracts do not guarantee annual inflationary increases, typical of the DME payor contracting environment. Contracted reimbursement rates are either subject to increases or decreases in CMS program rates or if not indexed to government rates, are frozen until those payors contracts are reopened and renegotiated. While we monitor reimbursement levels to identify specific payor reimbursement rates that have eroded and renegotiate such rates, we may not be able to maintain or improve overall reimbursement levels, thereby compromising the adequacy of the predicted allowance for doubtful accounts.

We may also face reduced reimbursements from private third party payors. As a result, our customers may be unable to make timely payments to us. Although we maintain allowances for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments, we cannot guarantee that we will continue to experience the same loss rates that we have in the past. If we begin to experience an increase in our loss rates in excess of our allowances for doubtful accounts it could materially and adversely impact our business, financial condition, results of operations and cash flows.

Our growth strategy includes expanding into treatment for cancers other than colorectal. There can be no assurance that continuous infusion-based regimens for these other cancers will become standards of care for large numbers of patients or that we will be successful in penetrating these different markets.

An aspect of our growth strategy is to expand into the treatment of other cancers, such as head, neck and gastric. This population of patients will expand only if clinical trial results for new drugs and new combinations of drugs demonstrate superior outcomes for regimens that include continuous infusion therapy relative to alternatives. No assurances can be given that these new drugs and drug combinations will be approved or will prove superior to oral medication or other treatment alternatives. In addition, no assurances can be given that we will be able to penetrate successfully any new markets that may develop in the future or manage the growth in additional resources that would be required.

Our business may be subject to natural forces beyond our control.

Natural disasters, including hurricanes, earthquakes, floods, excessive snowfall and other unfavorable weather conditions, may affect our operations. Natural catastrophes may have a detrimental effect on our gross revenue, preventing many patients from visiting a facility to obtain our ambulatory infusion pumps or receive treatment. Similarly, such events could impact key suppliers or vendors, disrupting the services or materials they provide us. The severity of these occurrences, should they ever occur, will determine the extent to which and if our business, financial condition, results of operations and cash flows is materially and adversely affected.

The industry in which we operate is intensely competitive and ever-changing. If we are unable to successfully compete with our competitors, our business operations may suffer.

The drug infusion industry is highly competitive. Some of our competitors and potential competitors, including some of the practices that we service, have significantly greater resources than we do for information technology, marketing and sales. As a result, they may be better able to compete for market share, even in areas in which our services may be superior. The industry is subject to technological changes and such changes may put our current fleet of pumps, smart pump licensing, our information technology solutions or our other technological-based solutions at a competitive disadvantage. Furthermore, the healthcare industry, in general, is experiencing market consolidation, reducing the number of decision makers. If we are unable to effectively compete in our market, our business, financial condition, results of operations and cash flows may be materially and adversely affected.

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Our industry is dependent on regulatory guidelines that affect our billing practices. If our competitors do not comply with these regulatory guidelines, our business could be adversely affected.

Aggressive competitors may not fully comply with rules regarding CMS and other payors’ billing and documentation requirements. Competitors, who do not meet the same standards of compliance that we do with respect to billing regulations, may put us at a potential competitive disadvantage. We are a participating provider with Medicare and under contract with approximately 340 third party payor networks, all of which have very stringent guidelines. If our competitors do not comply with these regulatory guidelines, we could be put at a potential competitive disadvantage and our business, financial condition, results of operations and cash flows could be material and adversely affected.

Although we do not manufacture the products we distribute, if one of the products distributed by us proves to be defective or is misused by a health care practitioner or patient, we may be subject to liability that could adversely affect our financial condition and results of operations.

Although we do not manufacture the pumps that we distribute, a defect in the design or manufacture of a pump distributed or serviced by us, or a failure of pumps distributed by us to perform for the use specified, could have a material and adverse effect on our reputation in the industry and subject us to claims of liability for injuries and otherwise. Misuse of the pumps distributed by us by a practitioner or patient that results in injury could similarly subject us to liability. Any substantial underinsured loss could have a material and adverse effect on our business, financial condition, results of operations and cash flows. Furthermore, any impairment of our reputation could have a material and adverse effect on our revenues and prospects for future business.

We intend to continue to pursue opportunities for the further expansion of our business through strategic alliances and/or joint ventures. Future strategic alliances and/or joint ventures may require significant resources and/or result in significant unanticipated costs or liabilities to us.

We intend to continue to pursue opportunities for the further expansion of our business through strategic alliances and/or joint ventures. Any future strategic alliances or joint ventures will depend on our ability to identify suitable partners, negotiate acceptable terms for such transactions and obtain financing, if necessary. These investments require significant managerial attention, which may be diverted from our other operations.

If we engage in strategic acquisitions, we may experience significant costs and difficulty in assimilating operations or personnel, which could threaten our future growth.

If we make any acquisitions, we could have difficulty assimilating operations, technologies and products and services. In addition, we could have difficulty integrating or retaining personnel and maintaining employee morale as we take steps to combine the personnel and business cultures of separate organizations into one and to eliminate duplicate positions and functions. It may also be difficult for us to preserve important relationships with others, such as strategic partners, customers, and suppliers, who may delay or defer decisions on agreements with us, or seek to change existing agreements with us, because of the acquisition. In addition, acquisitions may involve entering markets in which we have no or limited direct prior experience. The occurrence of any one or more of these factors could disrupt our ongoing business, distract our management’s and employees’ attention from our ongoing business operations, result in decreased operating performance and increase our expenses. Moreover, our profitability may suffer because of acquisition-related costs or amortization of intangible assets. Furthermore, we may have to incur debt or issue equity securities in future acquisitions. The issuance of equity securities would dilute our existing stockholders.

We may be unable to maintain adequate working relationships with health care professionals.

We seek to maintain close working relationships with respected physicians and medical personnel in hospitals and universities. We rely on these professionals to assist us in the development of proprietary service

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and improvements to complement and expand our existing service and product lines. If we are unable to maintain these relationships, our ability to market and sell new and improved products and services could decrease and future operating results could be unfavorably affected.

If we fail to comply with applicable governmental or accrediting bodies’ regulations, we could face substantial penalties and our business, operations and financial condition could be adversely affected.

Certain federal, state health care, and accreditation bodies’ laws and regulations, including those pertaining to fraud and abuse and patients’ rights are applicable to our business. The laws that affect our ability to operate include:

If our operations are found to be in violation of any of the laws described above or any other regulations that apply to us, we may be subject to penalties, including civil and criminal penalties, damages, fines and the curtailment or restructuring of our operations. Any penalties, damages, fines, curtailment or restructuring of our operations could materially and adversely affect our business, financial condition, results of operations and cash flows. Any action against us for violation of these laws, even if we successfully defend against it, could cause us to incur significant legal expenses and divert our management’s attention from the operation of our business. Moreover, achieving and sustaining compliance with applicable federal and state privacy, security and fraud laws may prove costly.

Failure to protect our intellectual property could substantially harm our business and operating results.

In order to protect our trade secrets and other confidential information, we rely in part on confidentiality agreements with our employees, consultants and third parties with whom we have relationships. These agreements may not effectively prevent disclosure of trade secrets and other confidential information and may not provide an adequate remedy in the event of misappropriation of trade secrets or any unauthorized disclosure of trade secrets and other confidential information. In addition, others may independently discover our trade secrets and confidential information, and in such cases we could not assert any trade secret rights against such parties. Costly and time-consuming litigation could be necessary to enforce or determine the scope of our trade secret rights and related confidentiality and nondisclosure provisions. Failure to obtain or maintain trade secret protection, or our competitors’ acquisition of our trade secrets, could materially and adversely affect our competitive business position.

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We are dependent upon executive officers and other key personnel. The loss of any of our executive officers or other key personnel could reduce our ability to manage our businesses and achieve our business plan, which could cause our sales to decline and our operating results and cash flows to suffer.

Our success is substantially dependent on the continued services of our executive officers and other key personnel who generally have extensive experience in our industry. Our future success also will depend in large part upon our ability to identify, attract and retain other highly qualified executive officers, managerial, finance, technical and sales and marketing personnel. Competition for these individuals is intense. The loss of the services of any executive officer or other key employee, or our failure to attract and retain other qualified and experienced personnel on acceptable terms, could have a material and adverse effect on our business, financial condition, results of operations and cash flows.

Covenants in our current and any future debt agreement restrict our business.

Our Credit Agreement contains, and the agreements that govern our future indebtedness may contain, covenants that restrict our ability to and the ability of our subsidiaries to, among other things:

These covenants may restrict our ability to operate our business. Our failure to comply with these covenants could result in an event of default that, if not cured or waived, could result in reduced liquidity for the Company and could have a material and adverse effect on our business, financial condition, results of operations and cash flows. Additionally, our ability to pay interest and repay the principal for our indebtedness is dependent upon our ability to manage our business operations, generate sufficient cash flows to service such debt and the other factors discussed in this section. There can be no assurance that we will be able to manage any of these risks successfully.

Economic uncertainty or economic deterioration could adversely affect us.

While the global economy is improving, there are still uncertainties surrounding the strength of the recovery that may continue to drive stock market and interest rate volatility and adversely impact consumer confidence, product demand, and our ability to refinance our debt. Economic conditions, along with our operating performance, may also materially and adversely impact our ability to access the financial markets. Accordingly, our future business and financial results are subject to uncertainty. If economic conditions deteriorate in the future, our future revenues and financial results could be materially and adversely affected.

RISK FACTORS RELATING SPECIFICALLY TO OUR COMMON STOCK

The market price of our common stock has been, and is likely to remain, volatile, subject to low trading volume and may decline in value.

The market price of our common stock has been and may continue to be volatile. Market prices for securities of health care services companies, including ours, have historically been volatile, and the market has

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from time to time experienced significant price and volume fluctuations that appear unrelated to the operating performance of particular companies. The following factors, among others, can have a significant effect on the market price of our common stock:

The realization of any risks described in these “Risk Factors” could also have a negative effect on the market price of our common stock.

We do not pay dividends and this may negatively affect the price of our stock.

Under the terms of our Credit Agreement, our ability to pay dividends on our common stock is limited and we do not anticipate paying dividends on our common stock in the foreseeable future. The future price of our common stock may be adversely impacted because we do not pay dividends.

Restricted stock and the exercise of stock options may depress our stock price and may result in dilution to our common stockholders.

There are a significant number of shares of restricted stock and outstanding options to purchase our stock. If the market price of our common stock rises above the exercise price of outstanding options, holders of those securities may be likely to exercise their options and sell the common stock acquired upon exercise in the open market. Sales of a substantial number of shares of our common stock in the public market by holders of options may depress the prevailing market price for our common stock and could impair our ability to raise capital through the future sale of our equity securities. Additionally, if the holders of outstanding options exercise those options, our common stockholders will incur dilution in their relative percentage ownership.

As of December 31, 2015, options to purchase 2.3 million shares of common stock were outstanding, at a weighted average exercise price of $2.49 per share, of which 1.4 million were exercisable at a weighted average exercise price of $2.45 per share. In addition, restricted stock of 0.2 million shares, with a weighted average grant date fair value of $2.09 per share, were outstanding and were issuable upon the vesting of certain time restrictions.

We may be subject to limitations on net operating loss carryforwards and certain built-in losses following an ownership change.

If we experience an ownership change, either via a major transaction or a series of trades where a substantial percentage of our ownership changes, which may be less than a majority of our ownership in certain cases, we may be limited in our ability to use our deferred tax assets and may be required to record a valuation allowance against such assets.

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During the fourth quarter of 2015, we completed an update to our analysis of past ownership (as defined under Section 382 of the Code), and as a result, we believe that, consistent with previously completed analyses, we have not experienced an ownership change from December 31, 2010 through the date of such updated analysis. We have undertaken a definitive analysis necessary to quantify the effect of ownership change as of December 31, 2010 on the net operating loss carryforwards generated prior to December 31, 2010. Based on the analysis, we are subject to an annual limitation of $1.8 million on our use of remaining pre-ownership change net operating loss carryforwards of $4.7 million (and certain other pre-change tax attributes). Our federal net operating loss carryforwards of approximately $15.5 million will begin to expire in various years beginning in 2028. There can be no assurance that we will not experience an ownership change in the future, in which case we may be limited in our ability to use our deferred tax assets and may be required to record a valuation allowance against such assets.

None.

We do not own any real property. We lease office and warehouse space at the following locations:

We believe that such office and warehouse space is suitable and adequate for our business.

From time to time in the ordinary course of our business, we may be involved in legal proceedings, the outcomes of which may not be determinable. We have insurance policies covering potential losses where such coverage is cost effective. We are not at this time involved in any legal proceedings that we believe could have a material effect on our business, financial condition, results of operations or cash flows.

Not applicable.

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PART II

The following tables set forth, for the calendar quarter indicated, the quarterly high and low bid information of our common stock, respectively, as reported on the NYSE-MKT. The quotations listed below reflect interdealer prices, without retail markup, markdown or commission and may not necessarily represent actual transactions.

Common Stock

Holders of Common Equity

As of February 29, 2016, we had approximately 350 stockholders of record of our common stock. This does not include beneficial owners of our common stock. None of our preferred stock is issued or outstanding.

Dividends

We have not paid any dividends on our common stock in the two most recent fiscal years. The payment of dividends in the future will be contingent upon our revenues and earnings, if any, capital requirements and general financial condition. Under the terms of our Credit Facility, we are limited in our ability to pay dividends. It is the present intention of our Board of Directors to retain all earnings, if any, for use in our business operations and, accordingly, our Board of Directors does not anticipate declaring any dividends in the foreseeable future.

Common Share Repurchase Program

Stock repurchases may be made through open market transactions, negotiated purchases or otherwise, at times and in such amounts as we deem to be appropriate. The timing and actual number of shares repurchased will depend on a variety of factors, including price, financing and regulatory requirements, as well as other market conditions. The program does not require us to repurchase any specific number of shares or to complete the program within a specific period of time. For the years ending December 31, 2015 and 2014, respectively, no shares were repurchased under this program.

Shares Forgone to Satisfy Minimum Statutory Withholdings

During the years ended December 31, 2015 and 2014, shares of common stock were issued to employees and directors as their restricted stock awards vested or stock options were exercised. Under the terms of our stock plans, at the election of each employee, we can authorize a net settlement of distributable shares to employees after satisfaction of an individual employees’ tax withholding obligations. For the years ended December 31, 2015 and 2014, respectively, we received 0.1 million of shares from employees for tax withholding obligations.

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Unregistered Sales of Equity Securities

We did not sell any unregistered securities during the fiscal year ended December 31, 2015.

Equity Compensation Plan Information

See Part III, Item 12 for information relating to securities authorized for issuance under our equity compensation plans.

Stock Performance Graph

InfuSystem is a smaller reporting company as defined by Rule 12b-2 of the Exchange Act and is not required to provide the information required under this item.

InfuSystem is a smaller reporting company as defined by Rule 12b-2 of the Exchange Act and is not required to provide the information required under this item.

The following discussion should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in this Annual Report on Form 10-K. The forward-looking statements included in this discussion and elsewhere in this Annual Report on Form 10-K involve risks and uncertainties, including those set forth under “Cautionary Statement About Forward-Looking Statements.” Actual results and experience could differ materially from the anticipated results and other expectations expressed in our forward-looking statements as a result of a number of factors, including but not limited to those discussed in this Item and in Item 1A — “Risk Factors.”

Overview

We are a leading provider of infusion pumps and related products and services for patients in the home, oncology clinics, ambulatory surgery centers, and other sites of care from five locations in the United States and Canada. We provide our products and services to hospitals, oncology practices and facilities and other alternate site health care providers. Headquartered in Madison Heights, Michigan, we deliver local, field-based customer support, and also operate pump service and repair Centers of Excellence in Michigan, Kansas, California, Texas, Georgia and Ontario, Canada. ISI is accredited by the CHAP while First Biomedical is ISO certified.

Our core service is to supply electronic ambulatory infusion pumps and associated disposable supply kits to oncology clinics, infusion clinics and hospital outpatient chemotherapy clinics to be utilized in the treatment of a variety of cancers including colorectal cancer and other disease states. Colorectal cancer is the third most prevalent form of cancer in the United States, according to the American Cancer Society, and the standard of care for the treatment of colorectal cancer relies upon continuous chemotherapy infusions delivered via ambulatory infusion pumps.

In addition, we sell or rent new and pre-owned pole mounted and ambulatory infusion pumps to, and provide biomedical recertification, maintenance and repair services for oncology practices as well as other alternate site settings including home care and home infusion providers, skilled nursing facilities, pain centers and others. We also provide these products and services to customers in the small-hospital market.

We purchase new and pre-owned pole mounted and ambulatory infusion pumps from a variety of sources on a non-exclusive basis. We repair, refurbish and provide biomedical certification for the devices as needed. The pumps are then available for sale, rental or to be used within our ambulatory infusion pump management service.

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We view our payor environment as changing. Management is intent on extending its considerable breadth of payor contracts as patients move into different insurance coverages, including Medicaid and Insurance Marketplace products. In some cases, this may slightly reduce our aggregate billed revenues payment rate but result in an overall increase in collected revenues, as shown by a reduction in bad debt expense. Consequently, we are increasingly focused on net collected revenues less bad debt.

In the midst of changes in the healthcare arena, we believe that we will support our overall business strategy discussed above by (i) focusing on supporting recurring revenues by increasing our pump fleet; (ii) improving liquidity and strengthening the balance sheet by keeping debt levels comparable to our operations; (iii) improving internal operational efficiencies,; (iv) increasing our product and services offerings,; (v) enhancing our technology offerings to the patients and providers of care; and (vi) investigating synergistic acquisitions.

For additional information pertaining to CMS, refer to Item 1 — Business — Significant Customers and also Recent Events in Our Business.

Key Business Metrics

Our management monitors a number of financial and non-financial measures and ratios on a regular basis in order to track the progress of our business and make adjustments as necessary. We believe that the most important of these measures and ratios include net revenue, net rental revenue, net collected rental revenue, gross margin, operating margin, net income, non-GAAP net income, net income per common share, non-GAAP net income per diluted share, EBITDA and Adjusted EBITDA, free cash flow, return on invested capital, cash and cash equivalents, net working capital, and debt levels including available credit and leverage ratios. These measures and ratios are compared to standards or objectives set by management, so that actions can be taken, as necessary, in order to achieve the standards and objectives.

InfuSystem Holdings, Inc. Results of Operations for the Year ended December 31, 2015 compared to the Year ended December 31, 2014

Revenues

Net Revenues — Net revenues for the fiscal year ended December 31, 2015 were $72.1 million, which represents a 9% increase over the prior year’s net revenues of $66.5 million, primarily due to continued growth in rentals, as further discussed below.

Rentals — Increased $5.8 million, or 10%, compared to the prior year, primarily related to the addition of larger customers and increased penetration into our existing customer accounts offset by a higher mix of Medicaid and patient payors in our rental business, which generally have lower net revenue rates than commercial payors. While billings increased 12%, mix of in and out of network billings versus patient pay and payor mix hampered the increase in revenue dollars. Such shifts have occurred, we believe, due to the ACA. We view our payor environment as changing. Management is intent on extending its considerable breadth of payor contracts as patients move into different insurance coverages, including Medicaid and Insurance Marketplace products. In some cases, this may slightly reduce our aggregate billed revenues payment rate but result in an overall increase in collected revenues, as shown by a reduction in bad debt expense. Consequently, we are increasingly focused on net collected revenues less bad debt.

Product Sales — Decreased $0.2 million, or 2%, compared to the prior year. Included in the fourth quarter of 2015 was a large sale of $0.9 million. The decrease in product sales compared to the prior year was largely attributable to our increased focus on rental revenues and higher margin sales.

Gross Profit — Increased $3.8 million, or 8%, compared to the prior year, largely attributable to the increase in rental revenues during 2015, which was offset by a $1.8 million increase in supply costs associated with the increase in rental revenues and the deployment of pumps to new therapy sites. Gross profit as a percentage of net revenues remained consistent with the prior year at 71%.

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Provision for Doubtful Accounts — Decreased $0.5 million compared to the prior year from 9% of net revenues to 7% of net revenues. This change is the result of the Company’s increased number of third-party payor contracts that are now being billed at in-network rates with lower rates of bad debt whereby previous insurance billings were billed at higher out-of-network rates and higher rates of bad debt. Bad debt is primarily associated with rental revenues.

Couple this change with the impact of the ACA, we view our payor environment as changing. Management is intent on continuing to extend its considerable breadth of payor contracts as patients move into different insurance coverages, including Medicaid and Insurance Marketplace products. As of December 31, 2015, we had more than 340 third party payor networks under contract. In some cases, this may slightly reduce our aggregate billed revenues payment rate but result in an overall increase in collected revenues, as shown by a reduction in bad debt expense. Consequently, we are increasingly focused on net collected revenues less bad debt. This effect and the success of the collection efforts and additional headcount put in place at the beginning of the year for patient receivables has contributed to the decrease in bad debts.

Amortization of Intangible Assets — Increased $0.4 million compared to the prior year. This increase was largely attributable to the completion of several IT projects, in turn increasing the related amortization, and the acquisition of Ciscura in April 2015 and the related amortization of intangibles.

Selling and Marketing Expenses — For the year ended December 31, 2015, our selling and marketing expenses increased to $10.4 million, or 7%, compared to December 31, 2014 but had a slight decrease as a percentage of net revenues from 15% in 2014 to 14% in 2015. Selling and marketing expenses during these years consisted of sales personnel salaries, commissions and associated fringe benefit and payroll-related items, marketing, share-based compensation, travel and entertainment and other miscellaneous expenses.

General and Administrative Expenses — General and administrative (“G&A”) expenses during 2015 and 2014 consisted primarily of accounting, administrative, third party payor billing and contract services, customer service, nurses on staff, new product services, and service center personnel salaries, fringe benefits and other payroll related items, professional fees, legal fees, stock-based compensation, insurance and other miscellaneous items. During the year ended December 31, 2015, our G&A expenses were $23.8 million, an increase of 19% from $20.0 million for the year ended December 31, 2014. The increase in G&A expenses versus the same prior year period was mainly attributable to increases in spending on IT and pain management initiatives of $0.9 million, increases in compensation and employee personnel of $1.9 million, increases in stock-based compensation of $0.4 million and $0.7 million in expenses associated with the acquisition, transition and integration for Ciscura. The Company has brought in-house certain services previously performed by outside advisors and contractors, including tax, legal, information technology, internal audit and increased warehouse headcount in Atlanta and Houston over the prior year period.

The following table includes additional details regarding our G&A expenses for the years ended December 31:

Other Income and Expenses — During the year ended December 31, 2015, we recorded interest expense of $1.7 million, compared to $3.1 million for the year ended December 31, 2014. This is a direct result of the lower

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interest rates with our new Credit Facility. In addition, we had other expenses of $1.6 million in 2015, primarily related to the write-off of deferred financing costs as a result of the early extinguishment of debt.

Provision for Income Taxes — During the year ended December 31, 2015, we recorded income tax expense of $1.8 million compared to $2.9 million for the year ended December 31, 2014. The effective tax rate for the year ended December 31, 2015 was 32.8% compared to 45.9% for the year ended December 31, 2014. The decrease in effective tax rate was primarily due to permanent differences of $0.2 million, less taxable income at the federal rate resulting in $0.2 million, foreign taxes of $0.2 million due to the completion of a transfer price study and adjustment to our Canadian income tax liability and benefits from research and development credits pertaining to our development of software that enables third parties to interact, initiate functions or review data on our system of $0.4 million. Refer to the discussion under “Summary of Significant Accounting Policies — Income Taxes” included in Note 2 and “Income Taxes” included in Note 8 to our Consolidated Financial Statements included in this Annual Report on Form 10-K.

Inflation — Management believes that there has been no material effect on our results of operations or financial condition as a result of inflation or changing prices of our ambulatory infusion pumps during the period from January 1, 2014 through December 31, 2015.

Liquidity and Capital Resources

Overview:

We finance our operations and capital expenditures with internally generated cash from operations. As of December 31, 2015, we had cash and cash equivalents of $0.8 million and $9.9 million of availability on our Revolver compared to $0.5 million of cash and cash equivalents and $6.6 million of availability on our then existing revolving line-of-credit at December 31, 2014. Our liquidity and borrowing plans are established to align with our financial and strategic planning processes and ensure we have the necessary funding to meet our operating commitments, which primarily include the purchase of pumps, inventory, payroll and general expenses. We also take into consideration our overall capital allocation strategy which includes investment for future growth and acquisitions. We believe we have adequate sources of liquidity and funding available for at least the next year, however, there are a number of factors that may negatively impact our available sources of funds. The amount of cash generated from operations will be dependent upon factors such as the successful execution of our business plan and general economic conditions. As of December 31, 2015, we were in compliance with all such covenants and expect to be in compliance over the next 12 months.

Long-Term Debt Activities:

On March 23, 2015, we and our direct and indirect subsidiaries entered into the Credit Agreement with the Lender. The borrowers under the Credit Agreement are the Company, Holdings, ISI, First Biomedical and IFC (collectively, the “Borrowers”). The Credit Agreement provides for the Credit Facility consisting of a $27.0 million Term Loan A, up to $8.0 million of a Term Loan B and a $10.0 million Revolver, all of which mature on March 23, 2020. In connection with these refinancing, we recorded a loss on extinguishment of long-term debt of $1.6 million in our Consolidated Statement of Operations for the year ended December 31, 2015.

On March 23, 2015, we drew $27.0 million under the Term Loan A to repay and terminate our previously existing credit facility. Term Loan B was unfunded at closing and beginning on April 20, 2015, the Closing Date of the acquisition of the assets of Ciscura, the Borrowers drew on Term Loan B in several installments in accordance with the requirements of the asset purchase agreement governing the acquisition to fund the acquisition and associated expenses. As of December 31, 2015, a total of approximately $6.3 million had been drawn on Term Loan B, with an additional $1.7 million available to be drawn under certain conditions for acquisitions. We recorded a $1.6 million as loss on extinguishment of long-term debt in our consolidated statement of operations as of December 31, 2015 for the write-off of deferred financing costs associated with the previous credit facility.

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During the year end December 31, 2015, we made optional pre-payments of $4.8 million on our Term Loan A, which we can apply against a future mandatory payment. Prepayments of $1.9 million were applied to September 30, 2015 and December 31, 2015 Term Loan A principal payments. Remaining prepayments of $2.9 million are available toward 2016 future mandatory payments.

As of December 31, 2015, interest on the Credit Facility was payable at our choice as a (i) Eurodollar Loan, which bears interest at a per annum rate equal to LIBOR, plus a margin ranging from 2.00% to 2.50% or (ii) CBFR Loan, which bears interest at a per annum rate equal to (a) the Lender’s prime rate or (b) LIBOR for a 30 day interest period, plus 2.50%, in each case, plus a margin ranging from -0.75% to -0.25%. The actual rate at December 31, 2015 was 2.73% (LIBOR of 0.23% plus 2.50%).

The availability under the Revolver is based upon our eligible accounts receivable and eligible inventory and is computed as of December 31 as follows (in thousands):

To secure repayment of the obligations of the Borrowers, each Borrower has granted to the Lender, for the benefit of various secured parties, a first priority security interest in substantially all of the personal property assets of each of the Borrowers. In addition, we have pledged the shares of Holdings and Holdings has pledged the shares of each of ISI and First Biomedical and the equity interests of IFC to the Lender, for the benefit of the secured parties, to further secure the obligations under the Credit Agreement.

The Credit Agreement contains certain affirmative and negative covenants typical for credit facilities of this type. These covenants (subject to certain agreed and customary exceptions set forth in the Credit Agreement) restrict or limit subject to the Lender’s prior consent, and in some cases prohibit, the Borrowers from engaging in certain actions, including its ability to, among other things: (i) incur indebtedness; (ii) create liens; (iii) engage in mergers, consolidations, liquidations or dissolutions; (iv) engage in acquisitions; (v) dispose of assets; (vi) pay dividends and distributions or repurchase capital stock or make other restricted payments; (vii) make investments, loans, guarantees or advances; (viii) engage in certain transactions with affiliates; (ix) enter into sale and leaseback transactions; (x) enter into hedging agreements; (xi) enter into agreements that restrict distributions from subsidiaries; and (xii) change their fiscal year.

In addition, the Credit Agreement requires us to maintain the following financial covenant obligations:

Acquisition:

On April 20, 2015, we acquired substantially all of the assets of Ciscura Holding Company, Inc., and its subsidiaries (“Ciscura”) for $6.2 million in cash and recorded approximately $0.7 million for integration, professional and other related expenses. See Note 3 – Business Combinations for additional information pertaining to this acquisition.

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Cash Flows:

Net cash provided by operating activities for the year ended December 31, 2015 was $7.1 million compared to $7.3 million for the year ended December 31, 2014. The decrease was primarily attributable to the cash flow effects of the changes in accounts receivable and the impact of non-cash transactions, including loss on extinguishment of debt, depreciation and loss on disposal of medical equipment.

Net cash used in investing activities for the year ended December 31, 2015 was $11.9 million compared to $2.8 million for the year ended December 31, 2014. The increase was primarily related to our acquisition of Ciscura for $6.2 million, a decrease of $1.7 million for the purchases of non-pump assets offset by an increase in the purchases of intangible assets of $2.2 million, and a decrease of $2.3 million in proceeds from the sale of medical equipment.

Net cash provided by financing activities for the year ended December 31, 2015 was $5.2 million compared to cash used of $5.0 million for the year ended December 31, 2014. This change is primarily attributable to the cash proceeds received as a result of our decision to refinance our debt in the first quarter of 2015 and drawdowns on our Term Loan B for the recent acquisition of Ciscura for $6.2 million.

We occasionally enter into capital leases to finance the purchase of ambulatory infusion pumps. The pumps are capitalized into medical equipment in rental service at their fair market value, which equals the value of the future minimum lease payments and are depreciated over the useful life of the pumps. The weighted average interest rate under capital leases was 4.8% as of December 31, 2015.

Contractual Obligations

InfuSystem is a smaller reporting company as defined by Rule 12b-2 of the Exchange Act and is not required to provide this information.

Contingent Liabilities

We are not aware of any contingent liabilities.

Off-Balance Sheet Arrangements

We do not have any material off-balance sheet arrangements.

Critical Accounting Policies and Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates, assumptions and judgments that affect the amounts reported in the financial statements, including the notes thereto. We consider critical accounting policies to be those that require more significant judgments and estimates in the preparation of our consolidated financial statements, including the following: revenue recognition, which includes contractual allowances; accounts receivable and allowance for doubtful accounts; sales return allowances; inventory reserves; long lived assets; intangible assets valuations; and income tax valuations. Management relies on historical experience and other assumptions believed to be reasonable in making its judgment and estimates. Actual results could differ materially from those estimates.

Management believes its application of accounting policies, and the estimates inherently required therein, are reasonable. These accounting policies and estimates are periodically reevaluated, and adjustments are made when facts and circumstances dictate a change.

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Our accounting policies are more fully described under the heading “Summary of Significant Accounting Policies” in Note 2 to our Consolidated Financial Statements included in this Annual Report on Form 10-K. We believe the following critical accounting estimates are the most significant to the presentation of our financial statements and require the most difficult, subjective and complex judgments:

Revenue Recognition

We recognize revenue for selling, renting and servicing new and pre-owned infusion pumps and other medical equipment to oncology practices as well as other alternate site settings including home care and home infusion providers, skilled nursing facilities, pain centers and others, when 1) persuasive evidence of an arrangement exists; 2) services have been rendered; 3) the price to the customer is fixed or determinable; and 4) collectability is reasonably assured. Persuasive evidence of an arrangement is determined to exist, and collectability is reasonably assured, when 1) we receive a physician’s written order and assignment of benefits, signed by the physician and patient, respectively; 2) we have verified actual pump usage and insurance coverage; and 3) we receive patient acknowledgement of assignment of benefits. We recognize rental revenue from electronic infusion pumps as earned, normally on a month-to-month basis. Pump rentals are billed at our established rates, which often differ from contractually allowable rates provided by third-party payors such as Medicare, Medicaid and commercial insurance carriers. All billings to third party payors are recorded net of provision for contractual adjustments to arrive at net revenues. We perform an analysis to estimate sales returns and record an allowance. This estimate is based on historical sales returns.

Due to the nature of the industry and the reimbursement environment in which we operate, certain estimates are required to record net revenues and accounts receivable at their net realizable values. Inherent in these estimates is the risk that they will have to be revised or updated as additional information becomes available. Specifically, the complexity of many third-party billing arrangements and the uncertainty of reimbursement amounts for certain services from certain payors may result in adjustments to amounts originally recorded. Due to continuing changes in the health care industry and third-party reimbursement, it is possible that management’s estimates could change in the near term, which could have an impact on our results of operations and cash flows.

For 2015 and 2014, our largest contracted payor was Medicare, which accounted for approximately 32% and 30% of our net revenue for ambulatory infusion pump services for the years ended December 31, 2015 and 2014, respectively. Medicare represented 20% and 18% of our consolidated accounts receivable, net for the years ended December 31, 2015 and 2014, respectively. For 2015 and 2014, our second largest contracted payor was a national association comprised of multiple members, which, in the aggregate, accounted for approximately 18% of our net revenue for ambulatory infusion pump services for both years ended December 31, 2015 and 2014. This same contracted payor represented 27% and 26% of our consolidated accounts receivable, net for the years ended December 31, 2015 and 2014, respectively. We also contract with various other third party payor organizations, commercial Medicare replacement plans, self-insured plans and numerous other insurance carriers. No individual payor, other than those listed above, accounted for greater than approximately 9% of our ambulatory infusion pump services net revenue for 2015 or 2014.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable are reported at the estimated net realizable amounts from patients, third-party payors and other direct pay customers for goods provided and services rendered. We perform periodic analyses to assess the accounts receivable balances and record an allowance for doubtful accounts based on the estimated collectability of the accounts such that the recorded amounts reflect estimated net realizable value. Upon determination that an account is uncollectible, the account is written-off and charged to the allowance.

Accounts receivable are reduced by an allowance for amounts that could become uncollectible in the future. Our estimate for allowance for doubtful accounts is based upon management’s assessment of historical and expected net collections. Due to continuing changes in the health care industry and third-party reimbursement it is possible that management’s estimates could change in the near term, which could have an impact on our business, financial condition, results of operations and cash flows.

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Income Taxes

We recognize deferred income tax liabilities and assets based on (i) the differences between the financial statement carrying amounts and the tax basis of assets and liabilities, using enacted tax rates in effect in the years the differences are expected to reverse and (ii) the tax credit carry forwards. Deferred income tax (expense) benefit results from the change in net deferred tax assets or deferred tax liabilities. A valuation allowance is recorded when, in the opinion of management, it is more likely than not that some or all of any deferred tax assets will not be realized.

Provisions for federal, state and foreign taxes are calculated based on reported pre-tax earnings based on current tax law and include the cumulative effect of any changes in tax rates from those used previously in determining deferred tax assets and liabilities. Certain items of income and expense are recognized in different time periods for financial reporting than for income tax purposes; thus, such provisions differ from the amounts currently receivable or payable.

We estimate the impact of uncertain income tax positions on the income tax return. These estimates impact income taxes receivable, accounts payable and accrued liabilities on the balance sheet and provision for income taxes on the income statement. We follow a two-step approach for recognizing uncertain tax positions. First, management evaluates the tax position for recognition by determining if the weight of available evidence indicates it is more-likely-than-not that the position will be sustained upon examination. Second, for positions that are determined are more-likely-than-not to be sustained, we recognize the tax benefit as the largest benefit that has a greater than 50% likelihood of being sustained. We establish a reserve for uncertain tax positions liability that is comprised of unrecognized tax benefits and related interest and penalties. We adjust this liability in the period in which an uncertain tax position is effectively settled, the statute of limitations expires for the relevant taxing authority to examine the tax position, or more information becomes available. For more information, refer to the “Income Taxes” discussion included in Note 8 in the Notes to the Consolidated Financial Statements.

Intangible Asset Valuation

We evaluate the carrying value of long-lived assets for impairment by analyzing the operating performance and anticipated future cash flows for those assets, whenever events or changes in circumstances indicate that the carrying amounts of such assets may not be recoverable. We evaluate the need to adjust the carrying value of the underlying assets if the sum of the expected cash flows is less than the carrying value. Our projection of future cash flows, the level of actual cash flows, the methods of estimation used for determining fair values and salvage values can impact impairment. Any changes in management’s judgments could result in greater or lesser annual depreciation and amortization expense or impairment charges in the future. Depreciation and amortization of long-lived assets is calculated using the straight-line method over the estimated useful lives of the assets.

We performed our annual impairment analysis in October 2015 and determined that the fair value of all indefinite-lived assets was greater than the carrying value, resulting in no impairment of indefinite-lived assets.

For more information, refer to the “Intangible Assets” discussion included in Note 6 in the Notes to the Consolidated Financial Statements.

InfuSystem is a smaller reporting company as defined by Rule 12b-2 of the Exchange Act and is not required to provide the information required under this item.

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Index to Financial Statements

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

InfuSystem Holdings, Inc.

Madison Heights, Michigan

We have audited the accompanying consolidated balance sheets of InfuSystem Holdings Inc., and subsidiaries (the “Company”) as of December 31, 2015 and 2014, and the related consolidated statements of operations, stockholders’ equity and cash flows for the years then ended. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2015 and 2014, and the results of their operations and their cash flows for the years then ended, in conformity with accounting principles generally accepted in the United States of America.

/s/BDO USA, LLP

Troy, Michigan

March 9, 2016

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INFUSYSTEM HOLDINGS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

See accompanying notes to consolidated financial statements.

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INFUSYSTEM HOLDINGS, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

See accompanying notes to consolidated financial statements.

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INFUSYSTEM HOLDINGS, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF

STOCKHOLDERS’ EQUITY

See accompanying notes to consolidated financial statements.

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INFUSYSTEM HOLDINGS, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

See accompanying notes to consolidated financial statements.

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The following table presents certain supplementary cash flow information for the years ended December 31 (in thousands):

See accompanying notes to consolidated financial statements.

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INFUSYSTEM HOLDINGS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

InfuSystem Holdings, Inc. and its consolidated subsidiaries (the “Company”), are a leading provider of infusion pumps and related products and services for patients in the home, oncology clinics, ambulatory surgery centers, and other sites of care from five locations in the United States and Canada. The Company provides products and services to hospitals, oncology practices and facilities and other alternate site health care providers. Headquartered in Madison Heights, Michigan, the Company delivers local, field-based customer support, and also operate pump service and repair Centers of Excellence in Michigan, Kansas, California, Texas, Georgia and Ontario, Canada. InfuSystem Inc. (“ISI”), which is an operating subsidiary of the Company, is accredited by the Community Health Accreditation Program (“CHAP”) while First Biomedical, Inc. (“First Biomedical”), which is an operating subsidiary of the Company, is ISO certified.

The Company’s core service is to supply electronic ambulatory infusion pumps and associated disposable supply kits to oncology clinics, infusion clinics and hospital outpatient chemotherapy clinics to be utilized in the treatment of a variety of cancers including colorectal cancer, pain management and other disease states. The majority of the Company’s pumps are electronic infusion pumps purchased from the following manufacturers, each of which supplies more than 10% of the ambulatory pumps purchased by the Company: Smiths Medical, Inc. and WalkMed Infusion, LLC. The Company has supply agreements in place with these suppliers. Certain “spot” purchases are made on the open market subject to individual negotiation.

In addition, the Company sells or rents new and pre-owned pole mounted and ambulatory infusion pumps to, and provides biomedical recertification, maintenance and repair services for, oncology practices, as well as other alternate site settings including home care and home infusion providers, skilled nursing facilities, pain centers and others. The Company also provides these products and services to customers in the small-hospital market.

The Company purchases new and pre-owned pole mounted and ambulatory infusion pumps from a variety of sources on a non-exclusive basis. The Company repairs, refurbishes and provides biomedical certification for the devices as needed. The pumps are then available for sale, rental or to be used within the Company’s ambulatory infusion pump management service.

The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”).

Presentation in the Consolidated Statements

The Company both rents and sells medical equipment. Management believes that the predominant source of revenues and cash flows from this medical equipment is from rentals and most equipment purchased is likely to be rented prior to being sold. Accordingly, the Company has concluded that (i) the assets specifically supporting its two primary revenue streams should be separately disclosed on the balance sheet; (ii) the purchase and sale of medical equipment should be classified solely in investing cash flows based on their predominant source; and (iii) other activities ancillary to the rental process should be consistently classified.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and all wholly owned organizations. All intercompany transactions and account balances have been eliminated in consolidation.

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Segments

The Company operates in one reportable segment based on management’s view of its business for purposes of evaluating performance and making operating decisions.

The Company utilizes shared services including but not limited to, human resources, payroll, finance, sales, pump repair and maintenance services, as well as certain shared assets and sales, general and administrative costs. The Company’s approach is to make operational decisions and assess performance based on delivering products and services that together provide solutions to its customer base, utilizing a functional management structure and shared services where possible. Based upon this business model, the chief operating decision maker only reviews consolidated financial information.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates, assumptions and judgments that affect the amounts reported in the financial statements, including the notes thereto. The Company considers critical accounting policies to be those that require more significant judgments and estimates in the preparation of its consolidated financial statements, including the following: revenue recognition, which includes contractual adjustments, accounts receivable and allowance for doubtful accounts, sales return allowances, inventory reserves, long lived assets, intangible assets valuations and income tax valuations. Management relies on historical experience and other assumptions believed to be reasonable in making its judgment and estimates. Actual results could differ materially from those estimates.

Business Combinations

The Company accounts for all business combinations using the acquisition method of accounting, which allocates the fair value of the purchase consideration to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values. The excess of the purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. When determining the fair values of assets acquired and liabilities assumed, management makes significant estimates and assumptions. The Company may utilize third-party valuation specialists to assist the Company in the allocation. Initial purchase price allocations are subject to revision within the measurement period, not to exceed one year from the date of acquisition. Acquisition-related expenses and transaction costs associated with business combinations are expensed as incurred.

Cash and Cash Equivalents

The Company considers all highly liquid investments with original maturities of three months or less to be cash equivalents. The Company maintains its cash and cash equivalents primarily with two financial institutions and is insured with the Federal Deposit Insurance Corporation.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable are reported at the estimated net realizable amounts from patients, third-party payors and other direct pay customers for goods provided and services rendered. The Company performs periodic analyses to assess the accounts receivable balances. It records an allowance for doubtful accounts based on the estimated collectability of the accounts such that the recorded amounts reflect estimated net realizable value. Upon determination that an account is uncollectible, the account is written-off and charged to the allowance.

Accounts receivable are reduced by an allowance for amounts that could become uncollectible in the future. The Company’s estimate for its allowance for doubtful accounts is based upon management’s assessment of historical and expected net collections. Due to continuing changes in the health care industry and third-party

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reimbursement, it is possible that management’s estimates could change in the near term, which could have a material impact on the Company’s business, financial position, results of operations and cash flows.

Following is an analysis of the allowance for doubtful accounts for the Company for the years ended December 31 (in thousands):

Inventories

The Company’s inventories consist of disposable products and related parts and supplies used in conjunction with medical equipment and are stated at the lower of cost (first-in, first-out basis) or market. The Company periodically performs an analysis of slow moving inventory and records a reserve based on estimated obsolete inventory, which was $0.1 million as of both December 31, 2015 and 2014.

Medical Equipment

Medical Equipment (“ME”) consists of equipment that the Company purchases from third-parties and is 1) held for sale or rent, and 2) used in service to generate rental revenue. ME, once placed into service, is depreciated using the straight-line method over the estimated useful lives of the equipment which is typically seven years. The Company does not depreciate ME held for sale or rent. When assets are sold, or otherwise disposed, the cost and related accumulated depreciation are removed from the accounts and a sale is recorded in the current period. The Company periodically performs an analysis of slow moving ME held for sale or rent and records a reserve based on estimated obsolescence, which was $0.2 million and $0.1 million, respectively, as of December 31, 2015 and 2014.

During the first quarter of 2014, the Company reassessed the estimated useful life of certain of its ME. As a result, the estimated useful life of the Company’s ME was extended from five to seven years due to the determination that the Company was using these assets longer than originally anticipated. A major factor in this change was the servicing of such equipment by the Company’s Kansas facility, which was acquired in 2010. As a result, disposal of such equipment has decreased significantly since that acquisition.

The change in the estimated useful lives of the Company’s ME was accounted for as a change in accounting estimate, on a prospective basis, effective January 1, 2014. The change in estimated useful lives resulted in $1.9 million less depreciation expense for the year ended December 31, 2014 than otherwise would have been recorded. After-tax, net income would have been lower by $1.1 million for the year ended December 31, 2014 if this change in estimate had not been made. The impact to basic and diluted income per share due to this change in estimate would have been $0.05 per share for the year ended December 31, 2014.

Property and Equipment

Property and equipment is stated at acquired cost and depreciated using the straight-line method over the estimated useful lives of the related assets, ranging from three to seven years. Externally purchased information technology software and hardware are depreciated over three years. Leasehold improvements are amortized using the straight-line method over the life of the asset or the remaining term of the lease, whichever is shorter. Maintenance and minor repairs are charged to operations as incurred. When assets are sold, or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts and any gain or loss is recorded in the current period.

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Intangible Assets

Intangible assets consist of trade names, physician and customer relationships, non-compete agreements and software. The physician and customer relationships and non-compete agreements arose primarily from the acquisitions of ISI and First Biomedical in 2010 and the acquisition of assets from Ciscura Holding Company, Inc. and its subsidiaries (“Ciscura”) in 2015. The Company amortizes the value assigned to the physician and customer relationships on a straight-line basis over the period of expected benefit, which ranges from fifteen to twenty years. The acquired physician and customer relationship base represents a valuable asset of the Company due to the expectation of future business opportunities to be leveraged from the existing relationship with each physician and customer. The Company has long-standing relationships with numerous oncology clinics, physicians, home care and home infusion providers, skilled nursing facilities, pain centers and others. The useful lives of these relationships are based on minimal attrition experienced to date by the Company and expectations of continued minimal attrition. Non-compete agreements are amortized on a straight-line basis with the amortization periods ranging from two to five years and acquired software is amortized on a straight-line basis over three years. Trade names associated with the original acquisition of InfuSystem are not amortized while trade names from the Ciscura asset acquisition in 2015 are amortized over one year.

Management tests trade names for impairment annually or as often as deemed necessary. The impairment test for intangible assets with indefinite lives consists of a comparison of the fair value of the intangible assets with their carrying amounts. If the carrying value of the intangible assets exceeds the fair value, an impairment loss is recognized in an amount equal to that excess. The Company determines the fair value of the reporting unit for goodwill impairment testing based on a discounted cash flow model. The Company determines the fair value of our intangibles assets with indefinite lives (trade names) through the royalty relief income valuation approach. The Company performed its annual impairment analysis as of October 2015 and determined that the fair value of the intangible assets with indefinite lives (trade names) was greater than their carrying value, resulting in no impairment.

Software Capitalization and Depreciation

We capitalize certain costs incurred in connection with obtaining or developing internal-use software, including payroll and payroll-related costs for employees who are directly associated with the internal-use software project, external direct costs of materials and services and interest costs while developing the software. Capitalized software costs are included in intangible assets, net and are amortized using the straight-line method over the estimated useful life of three to five years. Capitalization of such costs ceases when the project is substantially complete and ready for its intended purpose. Costs incurred during the preliminary project and post-implementation stages, as well as software maintenance and training costs, are expensed in the period in which they are incurred. The company capitalized $5.6 million and $3.4 million of internal-use software for the years ended December 31, 2015 and 2014, respectively. Amortization expense for capitalized software was $0.4 million in 2015 and $0.0 million in 2014.

Impairment of Long-Lived Assets

Long-lived assets held for use, which includes property and equipment and amortizable intangible assets, are reviewed for impairment when events or changes in circumstances indicate that their carrying value may not be recoverable. If an impairment indicator exists, the Company assesses the asset or asset group for recoverability. Recoverability of these assets is determined based upon the expected undiscounted future net cash flows from the operations to which the assets relate, utilizing management’s best estimates, appropriate assumptions and projections at the time. If the carrying value is determined not to be recoverable from future operating cash flows, the asset is deemed impaired and an impairment loss would be recognized to the extent the carrying value exceeded the estimated fair market value of the asset or asset group. The Company did not record any impairment related expenses for the years ended December 31, 2015 and 2014, respectively.

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Operating and Capital Leases

Leases for all of our corporate and other operating locations are under operating leases and the Company recognizes rent expense on a straight-line basis over the lease terms. Rent holidays and rent escalation clauses, which provide for scheduled rent increases during the lease term, are taken into account in computing straight-line rent expense included in our consolidated statements of operations. The difference between the rent due under the stated periods of the leases compared to that of the straight-line basis is recorded as a component of other long-term liabilities in the consolidated balance sheets. Landlord funded lease incentives, including tenant improvement allowances provided for our benefit, are recorded as leasehold improvement assets and as deferred rent in the consolidated balance sheets and are amortized to depreciation expense and as rent expense credits, respectively. The Company occasionally enters into capital leases to finance the purchase of ambulatory infusion pumps. The pumps are capitalized into medical equipment in rental service at their fair market value, which equals the value of the future minimum lease payments, and are depreciated over the useful life of the pumps. Under the terms of all such capital leases, the Company does not hold title to these pumps and will not obtain title until such time as the capital lease obligations are settled in full. The weighted average interest rate under capital leases was 4.8% as of December 31, 2015.

Revenue Recognition

The Company recognizes revenue for selling, renting and servicing new and pre-owned infusion pumps and other medical equipment to oncology practices as well as other alternate site settings including home care and home infusion providers, skilled nursing facilities, pain centers and others, when persuasive evidence of an arrangement exists; services have been rendered; the price to the customer is fixed or determinable; and collectability is reasonably assured. Persuasive evidence of an arrangement is determined to exist, and collectability is reasonably assured, when the Company (i) receives a physician’s written order and assignment of benefits, signed by the physician and patient, respectively, and (ii) has verified actual pump usage and insurance coverage and (iii) receives patient acknowledgement of assignment of benefits. The Company recognizes rental revenue from electronic infusion pumps as earned, normally on a month-to-month basis. Pump rentals are billed at the Company’s established rates, which often differ from contractually allowable rates provided by third-party payors such as Medicare, Medicaid and commercial insurance carriers. All billings to third party payors are recorded net of provision for contractual adjustments to arrive at net revenues. The Company performs an analysis to estimate sales returns and records an allowance for returns when the related sale is recognized. This estimate is based on historical sales returns.

Due to the nature of the industry and the reimbursement environment in which the Company operates, certain estimates are required to record net revenues and accounts receivable at their net realizable values. Inherent in these estimates is the risk that the estimates will have to be revised or updated as additional information becomes available. Specifically, the complexity of many third-party billing arrangements and the uncertainty of reimbursement amounts for certain services from certain payors may result in adjustments to amounts originally recorded. Due to continuing changes in the health care industry and third-party reimbursement, it is possible that management’s estimates could change in the near term, which could have a material impact on the Company’s results of operations and cash flows.

For 2015 and 2014, the Company’s largest contracted payor was Medicare, which accounted for approximately 32% and 30% of our net revenue for ambulatory infusion pump services for the years ended December 31, 2015 and 2014, respectively. Medicare represented 20% and 18% of the Company’s consolidated accounts receivable, net for the years ended December 31, 2015 and 2014, respectively. For 2015 and 2014, the Company’s second largest contracted payor was a national association comprised of multiple members, which, in the aggregate, accounted for approximately 18% of our net revenue for ambulatory infusion pump services for both years ended December 31, 2015 and 2014. This same contracted payor represented 27% and 26% of the Company’s consolidated accounts receivable, net for the years ended December 31, 2015 and 2014, respectively. The Company also contracted with various other third party payor organizations, commercial Medicare replacement plans, self-insured plans and numerous other insurance carriers. No individual payor, other than those listed above, accounted for greater than approximately 9% of the Company’s ambulatory infusion pump services net revenue for 2015 or 2014.

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Income Taxes

The Company recognizes deferred income tax liabilities and assets based on: (1) the differences between the financial statement carrying amounts and the tax basis of assets and liabilities using enacted tax rates in effect in the years the differences are expected to reverse and (2) the tax credit carry forwards. Deferred income tax (expense) benefit results from the change in net deferred tax assets or deferred tax liabilities. A valuation allowance is recorded when, in the opinion of management, it is more likely than not that some or all of any deferred tax assets will not be realized.

Provisions for federal, state and foreign taxes are calculated based on reported pre-tax earnings based on current tax law and include the cumulative effect of any changes in tax rates from those used previously in determining deferred tax assets and liabilities. Certain items of income and expense are recognized in different time periods for financial reporting than for income tax purposes; thus, such provisions differ from the amounts currently receivable or payable.

The Company follows a two-step approach for recognizing uncertain tax positions. First it evaluates the tax position for recognition by determining if the weight of available evidence indicates that it is more-likely-than-not to be sustained upon examination. Second, for positions that are determined to be more-likely-than-not to be sustained, it recognizes the tax benefits as the largest benefit that has a greater than 50% likelihood of being sustained. The Company establishes a reserve for uncertain tax positions liability that is comprised of unrecognized tax benefits and related interest and penalties. The Company recognizes interest and penalties related to uncertain tax positions in the provision of income taxes.

Share Based Payments

The determination of the fair value of stock option awards on the date of grant using option-pricing models is affected by the Company’s stock price, as well as assumptions regarding a number of other inputs using the Black-Scholes pricing model. These variables include the Company’s expected stock price volatility over the expected term of the awards, actual and projected employee stock option exercise behaviors, risk-free interest rates and expected dividends. The expected volatility is based on the historical volatility. The Company uses historical data to estimate stock option exercise and forfeiture rates. The expected term represents the period over which the share-based awards are expected to be outstanding. The dividend yield is an estimate of the expected dividend yield on the Company’s stock. The risk-free rate is based on U.S. Treasury yields in effect at the time of the grant for the expected term of the stock options. All stock option awards are amortized based on their graded vesting over the requisite service period of the awards. Compensation costs are recognized over the requisite service period using the accelerated method and included in selling expenses and general and administrative expenses, based upon the department to which the associated employee or non-employee resides.

Deferred Debt Issuance Costs

Capitalized debt issuance costs as of December 31, 2015 relate to the Company’s current Credit Facility with JPMorgan Chase Bank, N.A. Capitalized debt issuance costs as of December 31, 2014 relate to the Company’s previous Credit Facility with Wells Fargo, which was repaid and terminated during 2015. The Company classified the costs related to these agreements as non-current assets and amortizes them using the interest method through the maturity date of the underlying debt.

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Earnings Per Share

The Company reports its earnings per share in accordance with the “Earnings Per Share” topic of the FASB ASC, which requires the presentation of both basic and diluted earnings per share on the statements of operations. The diluted weighted average common shares includes adjustments for the potential effects of outstanding stock options but only in the periods in which such effect is dilutive under the treasury stock method. Included in our basic and diluted weighted average common shares are those stock options and common stock shares due to participants granted from the 2014 stock incentive plan. Antidilutive stock awards are comprised of stock options and unvested share awards, which would have been antidilutive in the application of the treasury stock method in accordance with “Earnings Per Share” topic of FASB ASC.

In accordance with this topic, the following table reconciles income and share amounts utilized to calculate basic and diluted net income per common share (in thousands):