Medicare Advantage in Boone County, Missouri
15,695 people in Boone County, Missouri were enrolled in Medicare Advantage in October 2026, 48.3% of 32,478 eligible beneficiaries (−0.7 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 62% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 4,335 (highly concentrated). For 2027, 2,601 members here are in plans that terminate or leave the county. MA plans offered go from 32 to 29.
Parent organizations in Boone County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 9,727 | −700 | 62.1% |
| Humana Inc. | 2,809 | +1,616 | 17.9% |
| CVS Health Corporation | 1,697 | +289 | 10.8% |
| Lumeris Group Holdings Corporation | 878 | +86 | 5.6% |
| Centene Corporation | 255 | +64 | 1.6% |
| Elevance Health, Inc. | 146 | −1,221 | 0.9% |
| Rifkin Managed Care Holding, LLC | 70 | −21 | 0.4% |
| Mitchell Family Office | 28 | new | 0.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 24 | −7 | 0.2% |
| Health Care Service Corporation | 21 | −1 | 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, 4,935 beneficiaries in Boone County were assigned to 85 Medicare Shared Savings Program ACOs, 42.9% of assignable Original Medicare beneficiaries. Together, roughly 71% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.