| Marriott claims Services |
| Mayo Health Plan of Arizona |
| Medicare |
| Mennonite Mutual |
| Mesa Public Schools (workers comp) |
| Metracomp |
| MIHS |
| MMSI |
| Mountain State Adm. Service |
| Multiplan and Value Point |
| Mutual of Omaha |
| National Provider Network (NPN) |
| Oxford Life |
| Pacificare |
| Phoenix Healthplan (PHP) Ahcccs |
| Pinnacle West |
| Pinnacle Risk |
| Plan Vista Solutions (formally NPPN) |
| PPO Next (formally PHN) |
| Preferred QSP |
| Premier Provider Network |
| Principal Financial Group |
| Private Healthcare Systems (PHCS) |
| Proamerica |
| Procura Management Inc. |
| Provider networks of America (Pro net) |
| Railroad Medicare |
| Rockport Healthcare Group Inc. |
| Rural Arizona Network |
| Schaller Anderson (TPA) |
| Secure Horizons |
| Sentry |
| Southwest Risk Services |
| Southwestern Teamsters Security Fund |
| State Compensation Fund |
| State Farm Ins. Company |
| Sta-Rite Industries |
| The Covenant Companies |
| The Reny Co. |
| Three Rivers Provider Network |
| TLC Advantage LLC |
| Tricare |
| Tristar (maricopa community College) |
| Unicare |
| Union Pacific Railroads Employees Health |
| United Healthcare Plan |
| Union Labor Life |
| United Medical Resources |
| Universal Healthcare |
| US Dept. of Labor |
| USA Manage Care aka USA Health Network |
| USSA Insurance |
| Valley Schools Ins. Co. |
| Workers Compensation Plan |
| Zenith Administrators |
| Zurich North America |
