Medicare Advantage in Washington County, Missouri
3,929 people in Washington County, Missouri were enrolled in Medicare Advantage in October 2026, 68.5% of 5,732 eligible beneficiaries (+1.6 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 45% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 2,804 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 53 members here are in plans that terminate or leave the county. MA plans offered go from 45 to 45.
Parent organizations in Washington County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,752 | −136 | 44.9% |
| Humana Inc. | 946 | +298 | 24.3% |
| CVS Health Corporation | 372 | +5 | 9.5% |
| Elevance Health, Inc. | 321 | −128 | 8.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 164 | −4 | 4.2% |
| Lumeris Group Holdings Corporation | 99 | +34 | 2.5% |
| Health Care Service Corporation | 82 | −14 | 2.1% |
| Devoted Health, Inc. | 80 | new | 2.1% |
| Centene Corporation | 61 | +5 | 1.6% |
| Rifkin Managed Care Holding, LLC | 21 | −1 | 0.5% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 621 beneficiaries in Washington County were assigned to 17 Medicare Shared Savings Program ACOs, 38.8% of assignable Original Medicare beneficiaries. Together, roughly 81% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.