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