SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Cash and Cash Equivalents — The Company considers all highly liquid investments with original maturities of three months or less to be cash equivalents. Accounts Receivable — The Company’s accounts receivable is reported at the net realizable value amount that reflects the consideration the Company expects to receive in exchange for providing services, which is inclusive of adjustments for price concessions. The majority of accounts receivable are due from private insurance carriers and governmental health care programs, such as Medicare and Medicaid. Price concessions may result from patient hardships, patient uncollectible accounts sent to collection agencies, lack of recovery due to not receiving prior authorization, differing interpretations of covered therapies in payer contracts, different pricing methodologies, or various other reasons. In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“ASC 606”), an allowance for doubtful accounts is established only as a result of an adverse change in the Company’s payers’ ability to pay outstanding billings. The Company had no allowance for doubtful accounts as of December 31, 2022 and 2021, respectively. Included in accounts receivable are earned but unbilled gross receivables of $101.5 million and $80.1 million as of December 31, 2022 and 2021, respectively. Delays ranging from one day up to several weeks between the date of service and billing can occur due to delays in obtaining certain required payer-specific documentation from internal and external sources. See Revenue Recognition for a further discussion of the Company’s revenue recognition policy. Inventories — Inventories, which consists primarily of pharmaceuticals, is stated at the lower of first‑in, first‑out cost or net realizable value basis, which the Company believes is reflective of the physical flow of inventories. Prepaid Expenses and Other Current Assets — Included in prepaid expenses and other current assets are rebates receivable from pharmaceutical and medical supply manufacturers of $53.4 million and $43.0 million for the years ended December 31, 2022 and 2021, respectively. Leases — The Company has lease agreements for facilities, warehouses, office space and property and equipment. At the inception of a contract, the Company determines if the contract is a lease or contains an embedded lease arrangement. Operating leases are included in the operating lease right-of-use asset (“ROU asset”) and operating lease liabilities in the consolidated financial statements. ROU assets, which represent the Company’s right to use the leased assets, and operating lease liabilities, which represent the present value of unpaid lease payments, are both recognized by the Company at the lease commencement date. The Company utilizes its estimated incremental borrowing rate at the lease commencement date to determine the present value of unpaid lease obligations. The rates are estimated primarily using a methodology dependent on the Company’s financial condition, creditworthiness, and availability of certain observable data. In particular, the Company considers its actual cost of borrowing for collateralized loans and its credit rating, along with the corporate bond yield curve in estimating its incremental borrowing rates. ROU assets are recorded as the amount of operating lease liability, adjusted for prepayments, accrued lease payments, initial direct costs, lease incentives, and impairment of the ROU asset. Tenant improvement allowances used to fund leasehold improvements are recognized when earned and reduce the related ROU asset. Tenant improvement allowances are recognized through the ROU asset as a reduction of expense over the term of the lease. Leases may contain rent escalations, however the Company recognizes the lease expense on a straight-line basis over the expected lease term. The Company reviews the terms of any lease renewal options to determine if it is reasonably certain that the renewal options will be exercised. The Company has determined that the expected lease term is typically the minimum non-cancelable period of the lease. The Company has lease agreements that contain both lease and non-lease components which the Company has elected to account for as a single lease component for all asset classes. Leases with an initial term of 12 months or less are not recorded on the consolidated balance sheet and are expensed on a straight-line basis over the term of the lease. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. See Note 8, Leases, for further discussion of leases. Goodwill, Intangible Assets, Property and Equipment, and Referral Sources — Goodwill represents the excess of the purchase price over the fair value of assets acquired and liabilities assumed. The Company accounts for goodwill under ASC Topic 350, Intangibles-Goodwill and Other. The Company tests goodwill for impairment annually, or more frequently whenever events or circumstances indicate impairment may exist. Goodwill is stated at cost less accumulated impairment losses. The Company completes its goodwill impairment test annually in the fourth quarter on a qualitative basis. See Note 10, Goodwill and Other Intangible Assets, for further discussion of the Company’s goodwill and other intangible assets. Intangible assets arising from the Company’s acquisitions are amortized on a straight‑line basis over the estimated useful life of each asset. Referral sources have a useful life of fifteen to twenty years. Trademarks/names have a useful life ranging from ten to fifteen years. The useful lives for other amortizable intangible assets range from approximately two to nine years. The Company does not have any indefinite‑lived intangible assets. Property and equipment is recorded at cost, net of accumulated depreciation. Depreciation on owned property and equipment is provided for on a straight‑line basis over the estimated useful lives of owned assets. Leasehold improvements are amortized over the estimated useful life of the property or over the term of the lease, whichever is shorter. Estimated useful lives are seven years for infusion pumps and three to thirteen years for equipment. Major repairs, which extend the useful life of an asset, are capitalized in the property and equipment accounts. Routine maintenance and repairs are expensed as incurred. Computer software is included in property and equipment and consists of purchased software and internally-developed software. The Company capitalizes application-stage development costs for significant internally-developed software projects. Once the software is ready for its intended use, these costs are amortized on a straight‑line basis over the software’s estimated useful life, generally five years. Costs recognized in the preliminary project phase and the post-implementation phase, as well as maintenance and training costs, are expensed as incurred. The Company assesses long‑lived assets for impairment whenever events or circumstances indicate that a certain asset or asset group may be impaired. If circumstances require a long-lived asset or asset group be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying amount exceeds its fair value. Equity-Method Investments — The Company’s investments in certain unconsolidated entities are accounted for under the equity method. The balance of these investments is included in other noncurrent assets in the accompanying consolidated balance sheets. As of December 31, 2022 and 2021, the balance of the investments was $19.4 million and $20.1 million, respectively. The investments are increased to reflect the Company’s capital contributions and equity in earnings of the investees. The investments are decreased to reflect the Company’s equity in losses of the investees and for distributions received that are not in excess of the carrying amount of the investments. The Company’s proportionate share of earnings or losses of the investees is recorded in equity in earnings of joint ventures in the accompanying consolidated statements of comprehensive income (loss). The Company’s proportionate share of earnings was $5.1 million, $6.0 million and $3.3 million for the years ended December 31, 2022, 2021 and 2020, respectively. Distributions from the investees are treated as cash inflows from operating activities in the consolidated statements of cash flows. During the years ended December 31, 2022, 2021 and 2020, the Company received distributions from the investees of $5.9 million, $2.9 million and $3.3 million, respectively. See Note 17, Related-Party Transactions, for discussion of related-party transactions with these investees. Hedging Instruments — The Company uses derivative financial instruments to limit its exposure to increases in the interest rate of its variable rate debt instruments. The derivative financial instruments are recognized on the consolidated balance sheets at fair value. See Note 12, Derivative Instruments, for additional information. At inception of the hedge, the Company designated the derivative instruments as a hedge of the cash flows related to the interest on the variable rate debt. For all instruments designated as hedges, the Company documents the hedging relationships and its risk management objective of the hedging relationship. For all hedging instruments, the terms of the hedge perfectly offset the hedged expected cash flows. Revenue Recognition — Net revenue is reported at the net realizable value amount that reflects the consideration the Company expects to receive in exchange for providing goods and services. Revenues are from government payers, commercial payers, and patients for goods and services provided and are based on a gross price based on payer contracts, fee schedules, or other arrangements less any implicit price concessions. Due to the nature of the health care industry and the reimbursement environment in which the Company operates, certain estimates are required to record revenue and accounts receivable at their net realizable values at the time goods or services are provided. Inherent in these estimates is the risk that they will have to be revised or updated as additional information becomes available. The Company assesses the expected consideration to be received at the time of patient acceptance, based on the verification of the patient’s insurance coverage, historical information with the patient, similar patients, or the payer. Performance obligations are determined based on the nature of the services provided by the Company. The majority of the Company’s performance obligations are to provide infusion services to deliver medicine, nutrients, or fluids directly into the body. The Company provides a variety of infusion-related therapies to patients, which frequently include multiple deliverables of pharmaceutical drugs and related nursing services. After applying the criteria from ASC 606, the Company concluded that multiple performance obligations exist in its contracts with its customers. Revenue is allocated to each performance obligation based on relative standalone price, determined based on reimbursement rates established in the third-party payer contracts. Pharmaceutical drug revenue is recognized at the time the pharmaceutical drug is delivered to the patient, and nursing revenue is recognized on the date of service. The Company's outstanding performance obligations relate to contracts with a duration of less than one year. Therefore, the Company has elected to apply the practical expedient provided by ASC 606 and is not required to disclose the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period. Any unsatisfied or partially unsatisfied performance obligations at the end of a reporting period are generally completed prior to the patient being discharged. See Note 4, Revenue for a further discussion of revenue. Cost of Revenue — Cost of revenue consists of the actual cost of pharmaceuticals and other medical supplies dispensed to patients, as well as all other costs directly related to the production of revenue. These costs include warehousing costs, purchasing costs, freight costs, cash discounts, wages and related costs for pharmacists and nurses, along with depreciation expense relating to revenue-generating assets, such as infusion pumps. The Company also receives rebates from pharmaceutical and medical supply manufacturers. Rebates are generally volume-based incentives and are recorded as a reduction of inventory and are accounted for as a reduction of cost of goods sold when the related inventory is sold. Selling, General and Administrative Expenses — Selling, general and administrative expenses mainly consist of salaries for administrative employees that directly and indirectly support the operations, occupancy costs, marketing expenditures, insurance, and professional fees. Stock Based Incentive Compensation — The Company accounts for stock-based incentive compensation expense in accordance with ASC Topic 718, Compensation-Stock Compensation (“ASC 718”). Stock-based incentive compensation expense is based on the grant date fair value. The Company estimates the fair value of stock option awards using a Black-Scholes option pricing model and the fair value of restricted stock unit awards using the closing price of the Company’s common stock on the grant date. For awards with a service-based vesting condition, the Company recognizes expense on a straight-line basis over the service period of the award. For awards with performance-based vesting conditions, the Company will recognize expense when it is probable that the performance-based conditions will be met. When the Company determines that it is probable that the performance-based conditions will be met, a cumulative catch-up of expense will be recorded as if the award had been vesting on a straight-line basis from the award date. The award will continue to be expensed on a straight-line basis through the remainder of the vesting period and will be updated if the Company determines that there has been a change in the probability of achieving the performance-based conditions. The Company records the impact of forfeited awards in the period in which the forfeiture occurs. Business Acquisitions — The Company accounts for business acquisitions in accordance with ASC Topic 805, Business Combinations, with assets and liabilities being recorded at their acquisition date fair value and goodwill being calculated as the purchase price in excess of the net identifiable assets. See Note 3, Business Acquisitions and Divestitures, for further discussion of the Company’s business acquisitions. Income Taxes — The Company accounts for income taxes using the asset and liability method. Deferred tax assets and liabilities are reported for book-tax basis differences and are measured based on currently enacted tax laws using rates expected to apply to taxable income in the years in which the differences are expected to reverse. The effect of a change in tax rate on deferred taxes is recognized in income tax expense in the period that includes the enactment date of the change. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts more likely than not to be realized. The Company recognizes income tax positions that are more likely than not to be sustained on their technical merits. The Company measures recognized income tax positions at the maximum benefit that is more likely than not, based on cumulative probability, realizable upon final settlement of the position. Interest and penalties related to unrecognized tax benefits are reported in income tax expense (benefit). Concentrations of Business Risk — The Company generates revenue from managed care contracts and other agreements with commercial third-party payers. Revenue related to the Company’s largest payer was approximately 14%, 16% and 15% for the years ended December 31, 2022, 2021 and 2020, respectively. There were no other managed care contracts that represent greater than 10% of revenue for the years presented. For the years ended December 31, 2022, 2021 and 2020, approximately 12%, 12% and 12%, respectively, of the Company’s revenue was reimbursable through direct government healthcare programs such as Medicare and Medicaid. As of December 31, 2022 and 2021, approximately 13% and 11%, respectively, of the Company’s accounts receivable was related to these programs. Governmental programs pay for services based on fee schedules and rates that are determined by the related governmental agency. Laws and regulations pertaining to government programs are complex and subject to interpretation. As a result, there is at least a reasonable possibility that recorded estimates will change in the near term. The Company does not require its patients nor other payers to carry collateral for any amounts owed for goods or services provided. Other than as discussed above, concentrations of credit risk relating to trade accounts receivable is limited due to the Company’s diversity of patients and payers. Further, the Company generally does not provide charity care; however, Option Care Health offers a financial assistance program for patients that meet certain defined hardship criteria. For the years ended December 31, 2022 and 2021, approximately 73% and 74%, respectively, of the Company’s pharmaceutical and medical supply purchases were from four vendors. For the year ended December 31, 2020, approximately 70% of the Company’s pharmaceutical and medical supply purchases were from three vendors. Although there are a limited number of suppliers, the Company believes that other vendors could provide similar products on comparable terms. However, a change in suppliers could cause delays in service delivery and possible losses in revenue, which could adversely affect the Company’s financial condition or operating results. Although there is uncertainty regarding the COVID-19 pandemic, as of December 31, 2022 the Company has been able to maintain adequate levels of supplies and pharmaceuticals to support its operations. Fair Value Measurements — The fair value measurement accounting standard, ASC Topic 820, Fair Value Measurement (“ASC 820”), provides a framework for measuring fair value and defines fair value as the price that would be received to sell an asset or paid to transfer a liability. Fair value is a market-based measurement that should be determined using assumptions that market participants would use in pricing an asset or liability. The standard establishes a valuation hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability developed based on independent market data sources. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would use in valuing the asset or liability developed based upon the best information available. The valuation hierarchy is composed of three categories. The categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The categories within the valuation hierarchy are described as follows: •Level 1 - Inputs to the fair value measurement are quoted prices in active markets for identical assets or liabilities. •Level 2 - Inputs to the fair value measurement include quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. •Level 3 - Inputs to the fair value measurement are unobservable inputs or valuation techniques. While the Company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. Recently Issued Accounting Pronouncements — In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This ASU provides optional expedient and exceptions for applying generally accepted accounting principles to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. In response to concerns about structural risks of interbank offered rates (“IBORs”), and, particularly, the risk of cessation of the London Interbank Offered Rate (“LIBOR”), regulators in several jurisdictions around the world have undertaken reference rate reform initiatives to identify alternative reference rates that are more observable or transaction based and less susceptible to manipulation. The ASU provides companies with optional guidance to ease the potential accounting burden associated with transitioning away from reference rates that are expected to be discontinued. The FASB further issued ASU 2021-01 to clarify the scope of Topic 848 and was effective immediately upon issuance. The ASU 2020-04 was adopted during the year ended December 31, 2022. The adoption did not have any material impact on the Company’s results of operations, cash flows or financial position.

Accounts Receivable — The Company’s accounts receivable is reported at the net realizable value amount that reflects the consideration the Company expects to receive in exchange for providing services, which is inclusive of adjustments for price concessions. The majority of accounts receivable are due from private insurance carriers and governmental health care programs, such as Medicare and Medicaid.

Price concessions may result from patient hardships, patient uncollectible accounts sent to collection agencies, lack of recovery due to not receiving prior authorization, differing interpretations of covered therapies in payer contracts, different pricing methodologies, or various other reasons. In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“ASC 606”), an allowance for doubtful accounts is established only as a result of an adverse change in the Company’s payers’ ability to pay outstanding billings. The Company had no allowance for doubtful accounts as of December 31, 2022 and 2021, respectively.

Included in accounts receivable are earned but unbilled gross receivables of $101.5 million and $80.1 million as of December 31, 2022 and 2021, respectively. Delays ranging from one day up to several weeks between the date of service and billing can occur due to delays in obtaining certain required payer-specific documentation from internal and external sources.

Leases — The Company has lease agreements for facilities, warehouses, office space and property and equipment. At the inception of a contract, the Company determines if the contract is a lease or contains an embedded lease arrangement. Operating leases are included in the operating lease right-of-use asset (“ROU asset”) and operating lease liabilities in the consolidated financial statements.

ROU assets, which represent the Company’s right to use the leased assets, and operating lease liabilities, which represent the present value of unpaid lease payments, are both recognized by the Company at the lease commencement date. The Company utilizes its estimated incremental borrowing rate at the lease commencement date to determine the present value of unpaid lease obligations. The rates are estimated primarily using a methodology dependent on the Company’s financial condition, creditworthiness, and availability of certain observable data. In particular, the Company considers its actual cost of borrowing for collateralized loans and its credit rating, along with the corporate bond yield curve in estimating its incremental borrowing rates. ROU assets are recorded as the amount of operating lease liability, adjusted for prepayments, accrued lease payments, initial direct costs, lease incentives, and impairment of the ROU asset. Tenant improvement allowances used to fund leasehold improvements are recognized when earned and reduce the related ROU asset. Tenant improvement allowances are recognized through the ROU asset as a reduction of expense over the term of the lease.

Leases may contain rent escalations, however the Company recognizes the lease expense on a straight-line basis over the expected lease term. The Company reviews the terms of any lease renewal options to determine if it is reasonably certain that the renewal options will be exercised. The Company has determined that the expected lease term is typically the minimum non-cancelable period of the lease.

The Company has lease agreements that contain both lease and non-lease components which the Company has elected to account for as a single lease component for all asset classes. Leases with an initial term of 12 months or less are not recorded on the consolidated balance sheet and are expensed on a straight-line basis over the term of the lease. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. See Note 8, Leases, for further discussion of leases.

Goodwill, Intangible Assets, Property and Equipment, and Referral Sources — Goodwill represents the excess of the purchase price over the fair value of assets acquired and liabilities assumed. The Company accounts for goodwill under ASC Topic 350, Intangibles-Goodwill and Other. The Company tests goodwill for impairment annually, or more frequently whenever events or circumstances indicate impairment may exist. Goodwill is stated at cost less accumulated impairment losses. The Company completes its goodwill impairment test annually in the fourth quarter on a qualitative basis. See Note 10, Goodwill and Other Intangible Assets, for further discussion of the Company’s goodwill and other intangible assets.

Intangible assets arising from the Company’s acquisitions are amortized on a straight‑line basis over the estimated useful life of each asset. Referral sources have a useful life of fifteen to twenty years. Trademarks/names have a useful life ranging from ten to fifteen years. The useful lives for other amortizable intangible assets range from approximately two to nine years. The Company does not have any indefinite‑lived intangible assets.

Property and equipment is recorded at cost, net of accumulated depreciation. Depreciation on owned property and equipment is provided for on a straight‑line basis over the estimated useful lives of owned assets. Leasehold improvements are amortized over the estimated useful life of the property or over the term of the lease, whichever is shorter. Estimated useful lives are seven years for infusion pumps and three to thirteen years for equipment. Major repairs, which extend the useful life of an asset, are capitalized in the property and equipment accounts. Routine maintenance and repairs are expensed as incurred. Computer software is included in property and equipment and consists of purchased software and internally-developed software. The Company capitalizes application-stage development costs for significant internally-developed software projects. Once the software is ready for its intended use, these costs are amortized on a straight‑line basis over the software’s estimated useful life, generally five years. Costs recognized in the preliminary project phase and the post-implementation phase, as well as maintenance and training costs, are expensed as incurred.

The Company assesses long‑lived assets for impairment whenever events or circumstances indicate that a certain asset or asset group may be impaired. If circumstances require a long-lived asset or asset group be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying amount exceeds its fair value.

Equity-Method Investments — The Company’s investments in certain unconsolidated entities are accounted for under the equity method. The balance of these investments is included in other noncurrent assets in the accompanying consolidated balance sheets. As of December 31, 2022 and 2021, the balance of the investments was $19.4 million and $20.1 million, respectively. The investments are increased to reflect the Company’s capital contributions and equity in earnings of the investees. The investments are decreased to reflect the Company’s equity in losses of the investees and for distributions received that are not in excess of the carrying amount of the investments. The Company’s proportionate share of earnings or losses of the investees is recorded in equity in earnings of joint ventures in the accompanying consolidated statements of comprehensive income (loss). The Company’s proportionate share of earnings was $5.1 million, $6.0 million and $3.3 million for the years ended December 31, 2022, 2021 and 2020, respectively. Distributions from the investees are treated as cash inflows from operating activities in the consolidated statements of cash flows. During the years ended December 31, 2022, 2021 and 2020, the Company received distributions from the investees of $5.9 million, $2.9 million and $3.3 million, respectively. See Note 17, Related-Party Transactions, for discussion of related-party transactions with these investees.

Hedging Instruments — The Company uses derivative financial instruments to limit its exposure to increases in the interest rate of its variable rate debt instruments. The derivative financial instruments are recognized on the consolidated balance sheets at fair value. See Note 12, Derivative Instruments, for additional information.

At inception of the hedge, the Company designated the derivative instruments as a hedge of the cash flows related to the interest on the variable rate debt. For all instruments designated as hedges, the Company documents the hedging relationships and its risk management objective of the hedging relationship. For all hedging instruments, the terms of the hedge perfectly offset the hedged expected cash flows.

Revenue Recognition — Net revenue is reported at the net realizable value amount that reflects the consideration the Company expects to receive in exchange for providing goods and services. Revenues are from government payers, commercial payers, and patients for goods and services provided and are based on a gross price based on payer contracts, fee schedules, or other arrangements less any implicit price concessions.

Due to the nature of the health care industry and the reimbursement environment in which the Company operates, certain estimates are required to record revenue and accounts receivable at their net realizable values at the time goods or services are provided. Inherent in these estimates is the risk that they will have to be revised or updated as additional information becomes available.

The Company assesses the expected consideration to be received at the time of patient acceptance, based on the verification of the patient’s insurance coverage, historical information with the patient, similar patients, or the payer. Performance obligations are determined based on the nature of the services provided by the Company. The majority of the Company’s performance obligations are to provide infusion services to deliver medicine, nutrients, or fluids directly into the body.

The Company provides a variety of infusion-related therapies to patients, which frequently include multiple deliverables of pharmaceutical drugs and related nursing services. After applying the criteria from ASC 606, the Company concluded that multiple performance obligations exist in its contracts with its customers. Revenue is allocated to each performance obligation based on relative standalone price, determined based on reimbursement rates established in the third-party payer contracts. Pharmaceutical drug revenue is recognized at the time the pharmaceutical drug is delivered to the patient, and nursing revenue is recognized on the date of service.

The Company's outstanding performance obligations relate to contracts with a duration of less than one year. Therefore, the Company has elected to apply the practical expedient provided by ASC 606 and is not required to disclose the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period. Any unsatisfied or partially unsatisfied performance obligations at the end of a reporting period are generally completed prior to the patient being discharged. See Note 4, Revenue for a further discussion of revenue.

Cost of Revenue — Cost of revenue consists of the actual cost of pharmaceuticals and other medical supplies dispensed to patients, as well as all other costs directly related to the production of revenue. These costs include warehousing costs, purchasing costs, freight costs, cash discounts, wages and related costs for pharmacists and nurses, along with depreciation expense relating to revenue-generating assets, such as infusion pumps.

Stock Based Incentive Compensation — The Company accounts for stock-based incentive compensation expense in accordance with ASC Topic 718, Compensation-Stock Compensation (“ASC 718”). Stock-based incentive compensation expense is based on the grant date fair value. The Company estimates the fair value of stock option awards using a Black-Scholes option pricing model and the fair value of restricted stock unit awards using the closing price of the Company’s common stock on the grant date. For awards with a service-based vesting condition, the Company recognizes expense on a straight-line basis over the service period of the award. For awards with performance-based vesting conditions, the Company will recognize expense when it is probable that the performance-based conditions will be met. When the Company determines that it is probable that the performance-based conditions will be met, a cumulative catch-up of expense will be recorded as if the award had been vesting on a straight-line basis from the award date. The award will continue to be expensed on a straight-line basis through the remainder of the vesting period and will be updated if the Company determines that there has been a change in the probability of achieving the performance-based conditions. The Company records the impact of forfeited awards in the period in which the forfeiture occurs.

Business Acquisitions — The Company accounts for business acquisitions in accordance with ASC Topic 805, Business Combinations, with assets and liabilities being recorded at their acquisition date fair value and goodwill being calculated as the purchase price in excess of the net identifiable assets. See Note 3, Business Acquisitions and Divestitures, for further discussion of the Company’s business acquisitions.

Income Taxes — The Company accounts for income taxes using the asset and liability method. Deferred tax assets and liabilities are reported for book-tax basis differences and are measured based on currently enacted tax laws using rates expected to apply to taxable income in the years in which the differences are expected to reverse. The effect of a change in tax rate on deferred taxes is recognized in income tax expense in the period that includes the enactment date of the change.

In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts more likely than not to be realized.

The Company recognizes income tax positions that are more likely than not to be sustained on their technical merits. The Company measures recognized income tax positions at the maximum benefit that is more likely than not, based on cumulative probability, realizable upon final settlement of the position. Interest and penalties related to unrecognized tax benefits are reported in income tax expense (benefit).

Concentrations of Business Risk — The Company generates revenue from managed care contracts and other agreements with commercial third-party payers. Revenue related to the Company’s largest payer was approximately 14%, 16% and 15% for the years ended December 31, 2022, 2021 and 2020, respectively. There were no other managed care contracts that represent greater than 10% of revenue for the years presented.

For the years ended December 31, 2022, 2021 and 2020, approximately 12%, 12% and 12%, respectively, of the Company’s revenue was reimbursable through direct government healthcare programs such as Medicare and Medicaid. As of December 31, 2022 and 2021, approximately 13% and 11%, respectively, of the Company’s accounts receivable was related to these programs. Governmental programs pay for services based on fee schedules and rates that are determined by the related governmental agency. Laws and regulations pertaining to government programs are complex and subject to interpretation. As a result, there is at least a reasonable possibility that recorded estimates will change in the near term.

The Company does not require its patients nor other payers to carry collateral for any amounts owed for goods or services provided. Other than as discussed above, concentrations of credit risk relating to trade accounts receivable is limited due to the Company’s diversity of patients and payers. Further, the Company generally does not provide charity care; however, Option Care Health offers a financial assistance program for patients that meet certain defined hardship criteria.

For the years ended December 31, 2022 and 2021, approximately 73% and 74%, respectively, of the Company’s pharmaceutical and medical supply purchases were from four vendors. For the year ended December 31, 2020, approximately 70% of the Company’s pharmaceutical and medical supply purchases were from three vendors. Although there are a limited number of suppliers, the Company believes that other vendors could provide similar products on comparable terms. However, a change in suppliers could cause delays in service delivery and possible losses in revenue, which could adversely affect the Company’s financial condition or operating results. Although there is uncertainty regarding the COVID-19 pandemic, as of December 31, 2022 the Company has been able to maintain adequate levels of supplies and pharmaceuticals to support its operations.

Fair Value Measurements — The fair value measurement accounting standard, ASC Topic 820, Fair Value Measurement (“ASC 820”), provides a framework for measuring fair value and defines fair value as the price that would be received to sell an asset or paid to transfer a liability. Fair value is a market-based measurement that should be determined using assumptions that market participants would use in pricing an asset or liability. The standard establishes a valuation hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability developed based on independent market data sources. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would use in valuing the asset or liability developed based upon the best information available. The valuation hierarchy is composed of three categories. The categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The categories within the valuation hierarchy are described as follows:

•Level 2 - Inputs to the fair value measurement include quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly.

While the Company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.