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