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