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