Medicare Advantage in Union County, Illinois
2,040 people in Union County, Illinois were enrolled in Medicare Advantage in October 2026, 44.1% of 4,629 eligible beneficiaries (+1.5 pts since October 2025). CVS Health Corporation is the largest parent organization with 62% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 4,338 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 167 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 25 to 20.
Parent organizations in Union County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 1,244 | +45 | 61.7% |
| UnitedHealth Group, Inc. | 392 | +47 | 19.4% |
| Humana Inc. | 232 | +22 | 11.5% |
| Centene Corporation | 74 | −5 | 3.7% |
| Molina Healthcare, Inc. | 39 | +4 | 1.9% |
| Health Care Service Corporation | 35 | −30 | 1.7% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 331 beneficiaries in Union County were assigned to 19 Medicare Shared Savings Program ACOs, 14.9% of assignable Original Medicare beneficiaries. Together, roughly 52% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.