Medicare Advantage in Macon County, Illinois
9,308 people in Macon County, Illinois were enrolled in Medicare Advantage in October 2026, 37.8% of 24,606 eligible beneficiaries (+0.7 pts since October 2025). CVS Health Corporation is the largest parent organization with 60% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 4,042 (highly concentrated). For 2027, 124 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 21 to 16.
Parent organizations in Macon County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 5,542 | −101 | 60.0% |
| Humana Inc. | 1,484 | +262 | 16.1% |
| UnitedHealth Group, Inc. | 1,017 | +437 | 11.0% |
| Centene Corporation | 543 | +111 | 5.9% |
| Molina Healthcare, Inc. | 511 | −60 | 5.5% |
| Health Care Service Corporation | 124 | −103 | 1.3% |
| Elevance Health, Inc. | 21 | −3 | 0.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 5,010 beneficiaries in Macon County were assigned to 58 Medicare Shared Savings Program ACOs, 41.0% of assignable Original Medicare beneficiaries. Together, roughly 63% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.