Medicare Advantage in Piatt County, Illinois
2,336 people in Piatt County, Illinois were enrolled in Medicare Advantage in October 2026, 56.0% of 4,172 eligible beneficiaries (−0.9 pts since October 2025). CVS Health Corporation is the largest parent organization with 74% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 5,624 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 949 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 23 to 16.
Parent organizations in Piatt County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 1,710 | +876 | 73.5% |
| Humana Inc. | 279 | +143 | 12.0% |
| UnitedHealth Group, Inc. | 164 | +63 | 7.1% |
| Centene Corporation | 86 | +13 | 3.7% |
| Molina Healthcare, Inc. | 44 | +1 | 1.9% |
| Health Care Service Corporation | 42 | +26 | 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, 1,094 beneficiaries in Piatt County were assigned to 12 Medicare Shared Savings Program ACOs, 77.7% of assignable Original Medicare beneficiaries. Together, roughly 90% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.