Medicare Advantage in Washington County, Illinois
1,107 people in Washington County, Illinois were enrolled in Medicare Advantage in October 2026, 31.2% of 3,552 eligible beneficiaries (+1.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 46% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 3,890 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 116 members here are in plans that terminate or leave the county. MA plans offered go from 35 to 23.
Parent organizations in Washington County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 479 | +100 | 46.1% |
| CVS Health Corporation | 429 | −74 | 41.3% |
| Humana Inc. | 64 | +14 | 6.2% |
| UMWA Health and Retirement Funds | 40 | −6 | 3.8% |
| Devoted Health, Inc. | 27 | new | 2.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,163 beneficiaries in Washington County were assigned to 12 Medicare Shared Savings Program ACOs, 58.2% 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.