NATURE OF OPERATIONS AND PRESENTATION OF FINANCIAL STATEMENTS	12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Presentation of Financial Statements	NATURE OF OPERATIONS AND PRESENTATION OF FINANCIAL STATEMENTS Corporate Organization and Business — HC Group Holdings II, Inc. (“HC II”) was incorporated under the laws of the State of Delaware on January 7, 2015, with its sole shareholder being HC Group Holdings I, LLC. (“HC I”). On April 7, 2015, HC I and HC II collectively acquired Walgreens Infusion Services, Inc. and its subsidiaries from Walgreen Co., and the business was rebranded as Option Care (“Option Care”). On March 14, 2019, HC I and HC II entered into a definitive agreement (the “Merger Agreement”) to merge with and into a wholly-owned subsidiary of BioScrip, Inc. (“BioScrip”), a national provider of infusion and home care management solutions, along with certain other subsidiaries of BioScrip and HC II. The merger contemplated by the Merger Agreement (the “Merger”) was completed on August 6, 2019 (the “Merger Date”). The Merger was accounted for as a reverse merger under the acquisition method of accounting for business combinations with Option Care being considered the accounting acquirer and BioScrip being considered the legal acquirer. Under the terms of the Merger Agreement, shares of HC II common stock issued and outstanding immediately prior to the Merger Date were converted into 542,261,567 shares (135,565,392 equivalent shares after adjusting for the one share for four share reverse stock split - see Note 20, Subsequent Events) of BioScrip common stock, par value $0.0001 (the “BioScrip common stock”). BioScrip also issued an additional 28,193,428 shares (7,048,357 equivalent shares after adjusting for the reverse stock split) to HC I in respect of certain outstanding unvested contingent restricted stock units of BioScrip, which are held in escrow to prevent dilution related to potential additional vesting on certain share-based instruments. See Note 17, Stockholders’ Equity, for additional discussion of these shares held in escrow. In conjunction with the Merger, holders of BioScrip preferred shares and certain warrants received 3,458,412 additional shares (864,603 equivalent shares after adjusting for the reverse stock split) of BioScrip common stock and preferred shares were repurchased for $125.8 million of cash. In addition, all legacy BioScrip debt was settled for $575.0 million. As a result of the Merger, BioScrip’s stockholders hold approximately 19.2% of the combined company, and HC I holds approximately 80.8% of the combined company. Following the close of the transaction, BioScrip was rebranded as Option Care Health, Inc. (“Option Care Health”, or the “Company”). The combined company’s stock was listed on the Nasdaq Capital Market as of December 31, 2019. See Note 3, Business Acquisitions, for further discussion on the Merger. Option Care Health, and its wholly-owned subsidiaries, provides infusion therapy and other ancillary health care services through a national network of 115 full service pharmacies. The Company contracts with managed care organizations, third-party payers, hospitals, physicians, and other referral sources to provide pharmaceuticals and complex compounded solutions to patients for intravenous delivery in the patients’ homes or other nonhospital settings. The Company operates in one segment, infusion services. Basis of Presentation — The accompanying consolidated financial statements have been prepared in conformity with generally accepted accounting principles (“GAAP”) in the United States. These principals require management to make certain estimates and assumptions in determining assets, liabilities, revenue, expenses, and related disclosures. Actual amounts could differ materially from those estimates. Principles of Consolidation — The Company’s consolidated financial statements include the accounts of Option Care Health, Inc. and its subsidiaries. The BioScrip results have been included in the consolidated financial results since the Merger Date. All intercompany transactions and balances are eliminated in consolidation. The Company has investments in companies that are 50% owned and are accounted for as equity-method investments. The Company’s share of earnings from equity-method investments is included in the line entitled “Equity in earnings of joint ventures” in the consolidated statements of comprehensive income (loss). See Note 11, Equity-Method Investments, for further discussion of the Company’s equity-method investments.

NATURE OF OPERATIONS AND PRESENTATION OF FINANCIAL STATEMENTS

Corporate Organization and Business — HC Group Holdings II, Inc. (“HC II”) was incorporated under the laws of the State of Delaware on January 7, 2015, with its sole shareholder being HC Group Holdings I, LLC. (“HC I”). On April 7, 2015, HC I and HC II collectively acquired Walgreens Infusion Services, Inc. and its subsidiaries from Walgreen Co., and the business was rebranded as Option Care (“Option Care”).

On March 14, 2019, HC I and HC II entered into a definitive agreement (the “Merger Agreement”) to merge with and into a wholly-owned subsidiary of BioScrip, Inc. (“BioScrip”), a national provider of infusion and home care management solutions, along with certain other subsidiaries of BioScrip and HC II. The merger contemplated by the Merger Agreement (the “Merger”) was completed on August 6, 2019 (the “Merger Date”). The Merger was accounted for as a reverse merger under the acquisition method of accounting for business combinations with Option Care being considered the accounting acquirer and BioScrip being considered the legal acquirer.

Under the terms of the Merger Agreement, shares of HC II common stock issued and outstanding immediately prior to the Merger Date were converted into 542,261,567 shares (135,565,392 equivalent shares after adjusting for the one share for four share reverse stock split - see Note 20, Subsequent Events) of BioScrip common stock, par value $0.0001 (the “BioScrip common stock”). BioScrip also issued an additional 28,193,428 shares (7,048,357 equivalent shares after adjusting for the reverse stock split) to HC I in respect of certain outstanding unvested contingent restricted stock units of BioScrip, which are held in escrow to prevent dilution related to potential additional vesting on certain share-based instruments. See Note 17, Stockholders’ Equity, for additional discussion of these shares held in escrow. In conjunction with the Merger, holders of BioScrip preferred shares and certain warrants received 3,458,412 additional shares (864,603 equivalent shares after adjusting for the reverse stock split) of BioScrip common stock and preferred shares were repurchased for $125.8 million of cash. In addition, all legacy BioScrip debt was settled for $575.0 million. As a result of the Merger, BioScrip’s stockholders hold approximately 19.2% of the combined company, and HC I holds approximately 80.8% of the combined company. Following the close of the transaction, BioScrip was rebranded as Option Care Health, Inc. (“Option Care Health”, or the “Company”). The combined company’s stock was listed on the Nasdaq Capital Market as of December 31, 2019. See Note 3, Business Acquisitions, for further discussion on the Merger.

Option Care Health, and its wholly-owned subsidiaries, provides infusion therapy and other ancillary health care services through a national network of 115 full service pharmacies. The Company contracts with managed care organizations, third-party payers, hospitals, physicians, and other referral sources to provide pharmaceuticals and complex compounded solutions to patients for intravenous delivery in the patients’ homes or other nonhospital settings. The Company operates in one segment, infusion services.

Basis of Presentation — The accompanying consolidated financial statements have been prepared in conformity with generally accepted accounting principles (“GAAP”) in the United States. These principals require management to make certain estimates and assumptions in determining assets, liabilities, revenue, expenses, and related disclosures. Actual amounts could differ materially from those estimates.

Principles of Consolidation — The Company’s consolidated financial statements include the accounts of Option Care Health, Inc. and its subsidiaries. The BioScrip results have been included in the consolidated financial results since the Merger Date. All intercompany transactions and balances are eliminated in consolidation.

The Company has investments in companies that are 50% owned and are accounted for as equity-method investments. The Company’s share of earnings from equity-method investments is included in the line entitled “Equity in earnings of joint ventures” in the consolidated statements of comprehensive income (loss). See Note 11, Equity-Method Investments, for further discussion of the Company’s equity-method investments.