| 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 | |
| Avera Health Plan | HMO | Northwestern Iowa | 888/322-2115 | AV1 | AV2 | |
| 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 | |
| BlueCHOICE | HMO | St. Clair And Madison Counties | 800/634-4395 | 9G1 | 9G2 | |
| 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 | |
| Group Health Plan | HMO | Southern/ Metro East/ Central | 800/743-3901 | MM1 | MM2 | |
| Health Alliance HMO | HMO | Central/ E.Central/ N.West/ South/ West IL | 800/851-3379 | FX1 | FX2 | |
| Humana Health Plan Inc. | HMO | Chicago area | 888/393-6765 | 751 | 752 | |
| John Deere Health Plan | HMO | Bloomingtn/ Joliet/ Moline/ Peoria/ RockIsld | 800/247-9110 | YH1 | YH2 | |
| Mail Handlers-High | FFS | nationwide | 800/410-7778 | 451 | 452 | |
| Mail Handlers-Std | FFS | nationwide | 800/410-7778 | 454 | 455 | |
| Mercy Health Plans/Premier | POS | Southwest Illinois | 800/327-0763 | 7M1 | 7M2 | |
| NALC | FFS | nationwide | 888/636-6252 | 321 | 322 | |
| OSF HealthPlans | HMO | Central/ Central-Northwestern Illinois | 800/673-5222 | 9F1 | 9F2 | |
| 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 | |
| PersonalCare's HMO | HMO | Central Illinois | 800/431-1211 | GE1 | GE2 | |
| 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 | |
| UNICARE HMO | HMO | Chicagoland area | 312/234-8855 | 171 | 172 | |
| Union Health Service | HMO | Chicago area | 312/829-4224 | 761 | 762 | |