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