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