| 1199SEIU in Baltimore City County, MD | AMERIGROUP in Baltimore City County, MD |
| APS Healthcare in Baltimore City County, MD | Aetna in Baltimore City County, MD |
| Alliance in Baltimore City County, MD | AmeriHealth in Baltimore City County, MD |
| American Behavioral in Baltimore City County, MD | Beech Street in Baltimore City County, MD |
| Behavioral Health Systems in Baltimore City County, MD | BlueCross and/or BlueShield in Baltimore City County, MD |
| CCN in Baltimore City County, MD | CHIPA/College Health in Baltimore City County, MD |
| Cascade Health in Baltimore City County, MD | Ceridian in Baltimore City County, MD |
| ChoiceCare in Baltimore City County, MD | Cigna in Baltimore City County, MD |
| ComPsych in Baltimore City County, MD | Corphealth in Baltimore City County, MD |
| Coventry in Baltimore City County, MD | First Choice Health in Baltimore City County, MD |
| First Health in Baltimore City County, MD | GHI/Group Health Incorporated in Baltimore City County, MD |
| Great-West in Baltimore City County, MD | Guardian in Baltimore City County, MD |
| HFN in Baltimore City County, MD | HIP/Health Plan of New York in Baltimore City County, MD |
| Harvard Pilgrim Health Care in Baltimore City County, MD | Health Net in Baltimore City County, MD |
| Holman Group in Baltimore City County, MD | Horizon Healthcare in Baltimore City County, MD |
| Humana in Baltimore City County, MD | Integrated Health Plan in Baltimore City County, MD |
| Interplan in Baltimore City County, MD | Kaiser in Baltimore City County, MD |
| LifeWise in Baltimore City County, MD | MAMSI in Baltimore City County, MD |
| MHN/Managed Health Network in Baltimore City County, MD | Magellan Behavioral Health in Baltimore City County, MD |
| MagnaCare in Baltimore City County, MD | Medica in Baltimore City County, MD |
| Medicaid in Baltimore City County, MD | Medical Mutual in Baltimore City County, MD |
| Medicare in Baltimore City County, MD | Multiplan in Baltimore City County, MD |
| NCPPO in Baltimore City County, MD | ODS in Baltimore City County, MD |
| Oxford in Baltimore City County, MD | PHCS/Private Health Care Systems in Baltimore City County, MD |
| PPOM in Baltimore City County, MD | PacifiCare in Baltimore City County, MD |
| PacificSource in Baltimore City County, MD | PreferredOne in Baltimore City County, MD |
| Providence in Baltimore City County, MD | Sloans Lake in Baltimore City County, MD |
| TRICARE in Baltimore City County, MD | TriWest0127 in Baltimore City County, MD |
| Tufts in Baltimore City County, MD | UniCare in Baltimore City County, MD |
| Uniform in Baltimore City County, MD | United in Baltimore City County, MD |
| VMC in Baltimore City County, MD | ValueOptions in Baltimore City County, MD |
| WellPoint in Baltimore City County, MD |