Medicare Advantage in Monroe County, Illinois
4,715 people in Monroe County, Illinois were enrolled in Medicare Advantage in October 2026, 53.4% of 8,834 eligible beneficiaries (−1.6 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 38% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 2,811 (highly concentrated). For 2027, 669 members here are in plans that terminate or leave the county. MA plans offered go from 40 to 32.
Parent organizations in Monroe County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,791 | +220 | 38.3% |
| CVS Health Corporation | 1,330 | −580 | 28.5% |
| Lumeris Group Holdings Corporation | 986 | +143 | 21.1% |
| Humana Inc. | 419 | +180 | 9.0% |
| Devoted Health, Inc. | 81 | new | 1.7% |
| Elevance Health, Inc. | 29 | +4 | 0.6% |
| UMWA Health and Retirement Funds | 23 | 0 | 0.5% |
| Centene Corporation | 12 | new | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,142 beneficiaries in Monroe County were assigned to 21 Medicare Shared Savings Program ACOs, 40.3% of assignable Original Medicare beneficiaries. Together, roughly 72% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.