Medicare Advantage in Carroll County, Illinois
1,804 people in Carroll County, Illinois were enrolled in Medicare Advantage in October 2026, 40.1% of 4,495 eligible beneficiaries (−0.1 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 35% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 2,796 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 20 to 18.
Parent organizations in Carroll County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 624 | −109 | 35.0% |
| Humana Inc. | 609 | +294 | 34.2% |
| CVS Health Corporation | 328 | −129 | 18.4% |
| Centene Corporation | 122 | +7 | 6.9% |
| Highmark Health | 58 | −3 | 3.3% |
| Molina Healthcare, Inc. | 27 | −2 | 1.5% |
| Health Care Service Corporation | 13 | −20 | 0.7% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 620 beneficiaries in Carroll County were assigned to 26 Medicare Shared Savings Program ACOs, 32.2% of assignable Original Medicare beneficiaries. Together, roughly 59% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.