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