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