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