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