| Aetna U. S. Healthcare, Inc. | HMO | Southern California area | 800/537-9384 | 2X1 | 2X2 | |
| Alliance Health Plan | FFS | nationwide | 202/939-6325 | 1R1 | 1R2 | |
| APWU Health Plan | FFS | nationwide | 800/222-2798 | 471 | 472 | |
| Association Benefit Plan | FFS | Specific Groups | 800/634-0069 | 421 | 422 | |
| Blue Cross and Blue Shield Service Benefit Plan-Basic | FFS | nationwide | Local phone # | 111 | 112 | |
| Blue Cross and Blue Shield Service Benefit Plan-Std | FFS | nationwide | Local phone # | 104 | 105 | |
| Blue Cross- HMO | HMO | Most of California | 800/235-8631 | M51 | M52 | |
| Blue Shield of CA Access+ | HMO | Most of California | 800/334-5847 | SJ1 | SJ2 | |
| CIGNA HealthCare of California | HMO | Northern/ Southern California | 800/244-6224 | 9T1 | 9T2 | |
| Foreign Service | FFS | Specific Groups | 202/833-4910 | 401 | 402 | |
| GEHA Benefit Plan-High | FFS | nationwide | 800/821-6136 | 311 | 312 | |
| GEHA Benefit Plan-Std | FFS | nationwide | 800/821-6136 | 314 | 315 | |
| Health Net | HMO | Most of California | 800/522-0088 | LB1 | LB2 | |
| Kaiser Permanente | HMO | Northern California | 800/464-4000 | 591 | 592 | |
| Kaiser Permanente | HMO | Southern California | 800/464-4000 | 621 | 622 | |
| Mail Handlers-High | FFS | nationwide | 800/410-7778 | 451 | 452 | |
| Mail Handlers-Std | FFS | nationwide | 800/410-7778 | 454 | 455 | |
| NALC | FFS | nationwide | 888/636-6252 | 321 | 322 | |
| PacifiCare Health Plans | HMO | Most of California | 800/531-3341 | CY1 | CY2 | |
| Panama Canal Area | FFS | Specific Groups | 732/222-2229 | 431 | 432 | |
| PBP Health Plan-High | FFS | nationwide | 703/683-5585 | 361 | 362 | |
| PBP Health Plan-Std | FFS | nationwide | 703/683-5585 | 364 | 365 | |
| Rural Carrier Benefit Plan | FFS | Specific Groups | 800/638-8432 | 381 | 382 | |
| SAMBA | FFS | Specific Groups | 800/638-6589 | 441 | 442 | |
| Secret Service | FFS | Specific Groups | 800/424-7474 | Y71 | Y72 | |
| UHP HEALTHCARE | HMO | LA/ Orange/ San Bernardino Counties | 800/544-0088 | C41 | C42 | |
| Universal Care | HMO | Southern California | 800/257-3087 | 6Q1 | 6Q2 | |
| Western Health Advantage | HMO | Northern California | 888/563-2250 | 5Z1 | 5Z2 | |