Medicare Advantage in Cass County, Illinois
1,116 people in Cass County, Illinois were enrolled in Medicare Advantage in October 2026, 41.3% of 2,701 eligible beneficiaries (+0.9 pts since October 2025). CVS Health Corporation is the largest parent organization with 60% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 4,158 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 260 members here are in plans that terminate or leave the county. MA plans offered go from 28 to 18.
Parent organizations in Cass County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 646 | +60 | 60.5% |
| Humana Inc. | 177 | +36 | 16.6% |
| UnitedHealth Group, Inc. | 143 | −10 | 13.4% |
| Centene Corporation | 58 | −5 | 5.4% |
| Molina Healthcare, Inc. | 24 | −5 | 2.2% |
| Devoted Health, Inc. | 19 | +8 | 1.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 500 beneficiaries in Cass County were assigned to 10 Medicare Shared Savings Program ACOs, 38.1% of assignable Original Medicare beneficiaries. Together, roughly 64% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.