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