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