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Top MA Enrollment Contracts in St. Louis, MO-IL (Feb 2026)
This page summarizes county-level Medicare Advantage enrollment by contract in this metro area.
Home / Data Tools / MA Enrollment / MA MSA Rankings / St. Louis, MO-IL
MSA rank: 12 of top 50 by MA enrollment. CBSA: 41180. MSA total enrollment: 363,796.
Data source: SCC Enrollment MA Alternative File (2026-02).
Top 10 Contracts
| Rank | Contract ID | Organization Name | Plan Type | Enrolled | Counties | MSA Share |
|---|---|---|---|---|---|---|
| 1 | H2802 | UNITEDHEALTHCARE OF THE MIDLANDS, INC. | HMO/HMOPOS | 88,560 | 15 | 24.3% |
| 2 | H2610 | ESSENCE HEALTHCARE, INC. | HMO/HMOPOS | 46,059 | 14 | 12.7% |
| 3 | H2663 | COVENTRY HEALTH CARE OF MISSOURI, INC. | HMO/HMOPOS | 39,582 | 13 | 10.9% |
| 4 | H2001 | SIERRA HEALTH AND LIFE INSURANCE COMPANY, INC. | Local PPO | 38,947 | 15 | 10.7% |
| 5 | H5522 | AETNA LIFE INSURANCE COMPANY | Local PPO | 18,555 | 15 | 5.1% |
| 6 | H2406 | CARE IMPROVEMENT PLUS SOUTH CENTRAL INSURANCE CO. | Local PPO | 16,005 | 14 | 4.4% |
| 7 | H0028 | CHA HMO, INC. | HMO/HMOPOS | 15,710 | 13 | 4.3% |
| 8 | H0169 | UNITEDHEALTHCARE OF WISCONSIN, INC. | HMO/HMOPOS | 13,808 | 7 | 3.8% |
| 9 | H3447 | HEALTHKEEPERS, INC. | HMO/HMOPOS | 12,116 | 7 | 3.3% |
| 10 | H4461 | CARITEN HEALTH PLAN INC. | HMO/HMOPOS | 11,871 | 7 | 3.3% |
Method note: Enrollment is based on legal state/county of residence for payment purposes and may include out-of-service-area beneficiaries.
Related Links
- Previous MSA: Dallas-Plano-Irving, TX
- Next MSA: Warren-Troy-Farmington Hills, MI
- All top 50 MSA pages
- MA Enrollment search tool
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