| 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 | |
| Bluecare Network of MI | HMO | Cheboygan and Roscommon Counties Area | 800/662-6667 | G71 | G72 | |
| Bluecare Network of MI | HMO | Genesee County Area | 800/662-6667 | KN1 | KN2 | |
| Bluecare Network of MI | HMO | Kalamazoo County Area | 800/662-6667 | KF1 | KF2 | |
| Bluecare Network of MI | HMO | Kent County Area | 800/662-6667 | KR1 | KR2 | |
| Bluecare Network of MI | HMO | Mid Michigan | 800/662-6667 | LN1 | LN2 | |
| Bluecare Network of MI | HMO | Midland County Area | 800/662-6667 | K51 | K52 | |
| Bluecare Network of MI | HMO | Southeast MI | 800/662-6667 | LX1 | LX2 | |
| 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 | |
| Grand Valley Health Plan | HMO | Grand Rapids area | 616/949-2410 | RL1 | RL2 | |
| Health Alliance | HMO | Southeastern Michigan/ Flint area | 800/422-4641 | 521 | 522 | |
| HealthPlus MI | HMO | Flint/ Saginaw areas | 800/332-9161 | X51 | X52 | |
| Mail Handlers-High | FFS | nationwide | 800/410-7778 | 451 | 452 | |
| Mail Handlers-Std | FFS | nationwide | 800/410-7778 | 454 | 455 | |
| M-Care | HMO | Mid and Southeastern Michigan | 800/658-8878 | EG1 | EG2 | |
| NALC | FFS | nationwide | 888/636-6252 | 321 | 322 | |
| OmniCare | HMO | Southeastern Michigan | 800/477-6664 | KA1 | KA2 | |
| 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 | |
| The Wellness Plan | HMO | Detroit/ Flint/ Muskegon Areas | 800/875-9355 | K31 | K32 | |
| Total Health Care | HMO | Greater Detroit/ Flint areas | 800/826-2862 | N21 | N22 | |