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