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