| Cover | Mar. 11, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 11, 2021 |
| Entity Registrant Name | OPTION CARE HEALTH, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-11993 |
| Entity Tax Identification Number | 05-0489664 |
| Entity Address, Address Line One | 3000 Lakeside Dr. |
| Entity Address, Address Line Two | Suite 300N |
| Entity Address, City or Town | Bannockburn |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60015 |
| City Area Code | 312 |
| Local Phone Number | 940-2443 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock, $0.0001 par value per share |
| Trading Symbol | OPCH |
| Security Exchange Name | NASDAQ |
| Amendment Flag | false |
| Entity Central Index Key | 0001014739 |
