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