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