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