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