Medicare Advantage in Massac County, Illinois
1,160 people in Massac County, Illinois were enrolled in Medicare Advantage in October 2026, 30.5% of 3,799 eligible beneficiaries (+1.4 pts since October 2025). CVS Health Corporation is the largest parent organization with 41% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 3,418 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 116 members here are in plans that terminate or leave the county. MA plans offered go from 11 to 14.
Parent organizations in Massac County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 466 | +57 | 41.1% |
| Humana Inc. | 418 | +29 | 36.9% |
| UnitedHealth Group, Inc. | 217 | +6 | 19.1% |
| Molina Healthcare, Inc. | 21 | +3 | 1.9% |
| Centene Corporation | 12 | −2 | 1.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,888 beneficiaries in Massac County were assigned to 17 Medicare Shared Savings Program ACOs, 81.1% of assignable Original Medicare beneficiaries. Together, roughly 87% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.