Medicare Advantage in Buchanan County, Missouri
7,133 people in Buchanan County, Missouri were enrolled in Medicare Advantage in October 2026, 37.5% of 19,020 eligible beneficiaries (+0.6 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 88% of reported enrollment; 4 parent organizations have 11 or more members and the HHI is 7,814 (highly concentrated). For 2027, 425 members here are in plans that terminate or leave the county. MA plans offered go from 14 to 11.
Parent organizations in Buchanan County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 6,234 | +258 | 87.9% |
| CVS Health Corporation | 645 | −76 | 9.1% |
| Humana Inc. | 173 | +30 | 2.4% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 41 | −4 | 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, 473 beneficiaries in Buchanan County were assigned to 41 Medicare Shared Savings Program ACOs, 4.8% of assignable Original Medicare beneficiaries. Together, roughly 40% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.