Medicare Advantage in Warren County, Missouri
6,361 people in Warren County, Missouri were enrolled in Medicare Advantage in October 2026, 69.7% of 9,121 eligible beneficiaries (+0.3 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 53% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 3,389 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 110 members here are in plans that terminate or leave the county. MA plans offered go from 44 to 44.
Parent organizations in Warren County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 3,373 | −118 | 53.2% |
| CVS Health Corporation | 1,147 | −79 | 18.1% |
| Humana Inc. | 814 | +408 | 12.8% |
| Lumeris Group Holdings Corporation | 378 | +96 | 6.0% |
| Elevance Health, Inc. | 285 | −71 | 4.5% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 140 | −8 | 2.2% |
| Rifkin Managed Care Holding, LLC | 57 | +4 | 0.9% |
| Centene Corporation | 52 | +13 | 0.8% |
| Devoted Health, Inc. | 51 | +32 | 0.8% |
| Health Care Service Corporation | 40 | +10 | 0.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,363 beneficiaries in Warren County were assigned to 24 Medicare Shared Savings Program ACOs, 69.3% of assignable Original Medicare beneficiaries. Together, roughly 91% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.