Medicare Advantage in Shelby County, Illinois
1,675 people in Shelby County, Illinois were enrolled in Medicare Advantage in October 2026, 31.2% of 5,368 eligible beneficiaries (+0.5 pts since October 2025). CVS Health Corporation is the largest parent organization with 67% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 4,848 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 550 members here are in plans that terminate or leave the county. MA plans offered go from 22 to 15.
Parent organizations in Shelby County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 1,109 | +35 | 67.3% |
| Humana Inc. | 221 | +80 | 13.4% |
| UnitedHealth Group, Inc. | 167 | +6 | 10.1% |
| Centene Corporation | 75 | +6 | 4.6% |
| Molina Healthcare, Inc. | 39 | −9 | 2.4% |
| Devoted Health, Inc. | 36 | new | 2.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,708 beneficiaries in Shelby County were assigned to 22 Medicare Shared Savings Program ACOs, 54.5% of assignable Original Medicare beneficiaries. Together, roughly 69% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.