Medicare Advantage in Whiteside County, Illinois
5,964 people in Whiteside County, Illinois were enrolled in Medicare Advantage in October 2026, 40.6% of 14,674 eligible beneficiaries (+0.3 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 47% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 3,373 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 31 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 26 to 18.
Parent organizations in Whiteside County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 2,813 | −405 | 47.3% |
| CVS Health Corporation | 1,664 | +264 | 28.0% |
| Humana Inc. | 1,082 | +271 | 18.2% |
| Centene Corporation | 187 | +27 | 3.1% |
| Molina Healthcare, Inc. | 121 | −6 | 2.0% |
| Health Care Service Corporation | 75 | 0 | 1.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,782 beneficiaries in Whiteside County were assigned to 41 Medicare Shared Savings Program ACOs, 27.4% of assignable Original Medicare beneficiaries. Together, roughly 57% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.