| Aetna | Medichoice Network |
| American Preferred Provider | Multiplan |
| Amerihealth | Nat’l Preferred Provider Network |
| Case Management Assoc. | National Benefits Admin. |
| Empire BC/BS of New York | North American Health Plans |
| Family Choice Health Alliance | Oxford Health Plans |
| First Allmerica | Private Healthcare Systems |
| Guardian | Prudential |
| Healthnet/PHS | Qualcare |
| Horizon BC/BS of NJ | The Maxon Company |
| Insurance Design Administrations | United Healthcare |
| Local Health & Welfare Funds | University Health Plan |
| Magnacare | Value RX |
| Mastercare | Well Choice |
