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