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