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