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