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