Medicare Advantage in Will County, Illinois
52,799 people in Will County, Illinois were enrolled in Medicare Advantage in October 2026, 41.7% of 126,570 eligible beneficiaries (−0.2 pts since October 2025). Humana Inc. is the largest parent organization with 42% of reported enrollment; 14 parent organizations have 11 or more members and the HHI is 2,774 (highly concentrated). For 2027, 2,704 members here are in plans that terminate or leave the county. MA plans offered go from 56 to 45.
Parent organizations in Will County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 22,152 | +3,990 | 42.1% |
| CVS Health Corporation | 12,798 | −507 | 24.3% |
| UnitedHealth Group, Inc. | 9,026 | −588 | 17.1% |
| Health Care Service Corporation | 5,551 | −1,708 | 10.5% |
| Centene Corporation | 1,206 | −118 | 2.3% |
| Devoted Health, Inc. | 644 | +233 | 1.2% |
| Zing Health Consolidator, Inc | 544 | +48 | 1.0% |
| Lumeris Group Holdings Corporation | 238 | +166 | 0.5% |
| Molina Healthcare, Inc. | 237 | +41 | 0.5% |
| Elevance Health, Inc. | 101 | −1 | 0.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 61 | −3 | 0.1% |
| Rifkin Managed Care Holding, LLC | 50 | −1 | under 0.1% |
| Union Health Services, Inc. | 31 | +5 | under 0.1% |
| Highmark Health | 14 | +3 | under 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, 21,841 beneficiaries in Will County were assigned to 139 Medicare Shared Savings Program ACOs, 42.6% of assignable Original Medicare beneficiaries. Together, roughly 67% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.