Medicare Advantage in Sangamon County, Illinois
27,119 people in Sangamon County, Illinois were enrolled in Medicare Advantage in October 2026, 59.3% of 45,714 eligible beneficiaries (+0.3 pts since October 2025). CVS Health Corporation is the largest parent organization with 74% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 5,685 (highly concentrated). For 2027, 273 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 26 to 22.
Parent organizations in Sangamon County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 20,037 | +526 | 74.1% |
| Humana Inc. | 2,604 | +499 | 9.6% |
| UnitedHealth Group, Inc. | 2,529 | −286 | 9.4% |
| Centene Corporation | 676 | +177 | 2.5% |
| Molina Healthcare, Inc. | 416 | −7 | 1.5% |
| Devoted Health, Inc. | 372 | +283 | 1.4% |
| Health Care Service Corporation | 359 | −30 | 1.3% |
| UMWA Health and Retirement Funds | 44 | −5 | 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, 7,259 beneficiaries in Sangamon County were assigned to 71 Medicare Shared Savings Program ACOs, 50.1% 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.