Medicare Advantage in Clinton County, Illinois
3,476 people in Clinton County, Illinois were enrolled in Medicare Advantage in October 2026, 39.4% of 8,812 eligible beneficiaries (+0.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 52% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 3,649 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 129 members here are in plans that terminate or leave the county. MA plans offered go from 44 to 38.
Parent organizations in Clinton County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,780 | +119 | 52.0% |
| CVS Health Corporation | 984 | −196 | 28.7% |
| Humana Inc. | 308 | +83 | 9.0% |
| Lumeris Group Holdings Corporation | 199 | +97 | 5.8% |
| Devoted Health, Inc. | 96 | +80 | 2.8% |
| Molina Healthcare, Inc. | 47 | −2 | 1.4% |
| UMWA Health and Retirement Funds | 12 | 0 | 0.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,033 beneficiaries in Clinton County were assigned to 26 Medicare Shared Savings Program ACOs, 23.6% of assignable Original Medicare beneficiaries. Together, roughly 54% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.