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