Medicare Advantage in McHenry County, Illinois
24,819 people in McHenry County, Illinois were enrolled in Medicare Advantage in October 2026, 37.0% of 67,051 eligible beneficiaries (+0.3 pts since October 2025). Humana Inc. is the largest parent organization with 43% of reported enrollment; 11 parent organizations have 11 or more members and the HHI is 2,850 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 8,665 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 46 to 26.
Parent organizations in McHenry County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 10,708 | +4,233 | 43.3% |
| CVS Health Corporation | 5,279 | −3,318 | 21.3% |
| UnitedHealth Group, Inc. | 5,151 | +73 | 20.8% |
| Health Care Service Corporation | 2,177 | −114 | 8.8% |
| Devoted Health, Inc. | 561 | +207 | 2.3% |
| Zing Health Consolidator, Inc | 392 | +129 | 1.6% |
| Centene Corporation | 230 | −76 | 0.9% |
| Molina Healthcare, Inc. | 115 | +27 | 0.5% |
| Rifkin Managed Care Holding, LLC | 46 | −15 | 0.2% |
| Elevance Health, Inc. | 40 | +2 | 0.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 36 | −1 | 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 17,734 beneficiaries in McHenry County were assigned to 111 Medicare Shared Savings Program ACOs, 58.8% of assignable Original Medicare beneficiaries. Together, roughly 74% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.