Medicare Advantage in St. Louis City, Missouri
31,913 people in St. Louis City, Missouri were enrolled in Medicare Advantage in October 2026, 64.4% of 49,517 eligible beneficiaries (−0.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 41% of reported enrollment; 11 parent organizations have 11 or more members and the HHI is 2,485 (highly concentrated). For 2027, 465 members here are in plans that terminate or leave the county. MA plans offered go from 45 to 45.
Parent organizations in St. Louis City
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 13,182 | −683 | 41.4% |
| Humana Inc. | 5,328 | +2,009 | 16.7% |
| CVS Health Corporation | 5,024 | −529 | 15.8% |
| Lumeris Group Holdings Corporation | 4,169 | −128 | 13.1% |
| Elevance Health, Inc. | 2,389 | −935 | 7.5% |
| Devoted Health, Inc. | 925 | +462 | 2.9% |
| Centene Corporation | 314 | −17 | 1.0% |
| Health Care Service Corporation | 299 | +78 | 0.9% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 125 | −12 | 0.4% |
| Midwest Christian Villages, Inc. | 52 | +1 | 0.2% |
| Mitchell Family Office | 11 | −1 | under 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 3,908 beneficiaries in St. Louis City were assigned to 98 Medicare Shared Savings Program ACOs, 37.3% of assignable Original Medicare beneficiaries. Together, roughly 78% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.