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