Medicare Advantage in Clay County, Illinois
842 people in Clay County, Illinois were enrolled in Medicare Advantage in October 2026, 25.3% of 3,328 eligible beneficiaries (+0.1 pts since October 2025). CVS Health Corporation is the largest parent organization with 61% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 4,249 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 21 to 16.
Parent organizations in Clay County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 494 | +27 | 61.4% |
| UnitedHealth Group, Inc. | 132 | +2 | 16.4% |
| Humana Inc. | 93 | +4 | 11.6% |
| Centene Corporation | 71 | +15 | 8.8% |
| Health Care Service Corporation | 15 | −2 | 1.9% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,598 beneficiaries in Clay County were assigned to 19 Medicare Shared Savings Program ACOs, 73.9% of assignable Original Medicare beneficiaries. Together, roughly 80% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.