Medicare Advantage in Rock Island County, Illinois
19,558 people in Rock Island County, Illinois were enrolled in Medicare Advantage in October 2026, 59.2% of 33,030 eligible beneficiaries (−0.2 pts since October 2025). CVS Health Corporation is the largest parent organization with 50% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 3,780 (highly concentrated). For 2027, 176 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 28 to 24.
Parent organizations in Rock Island County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 9,753 | +4,127 | 50.1% |
| UnitedHealth Group, Inc. | 6,539 | −2,591 | 33.6% |
| Humana Inc. | 2,252 | +413 | 11.6% |
| Centene Corporation | 576 | +37 | 3.0% |
| Health Care Service Corporation | 205 | −61 | 1.1% |
| Molina Healthcare, Inc. | 150 | −16 | 0.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 5,836 beneficiaries in Rock Island County were assigned to 58 Medicare Shared Savings Program ACOs, 57.7% of assignable Original Medicare beneficiaries. Together, roughly 83% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.