Medicare Advantage in Lake County, Illinois
47,006 people in Lake County, Illinois were enrolled in Medicare Advantage in October 2026, 34.8% of 135,162 eligible beneficiaries (+0.2 pts since October 2025). Humana Inc. is the largest parent organization with 45% of reported enrollment; 13 parent organizations have 11 or more members and the HHI is 3,018 (highly concentrated). For 2027, 2,450 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 44 to 32.
Parent organizations in Lake County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 20,913 | +4,503 | 44.6% |
| UnitedHealth Group, Inc. | 10,566 | +143 | 22.5% |
| CVS Health Corporation | 10,232 | −1,585 | 21.8% |
| Health Care Service Corporation | 2,776 | −1,701 | 5.9% |
| Devoted Health, Inc. | 940 | +219 | 2.0% |
| Centene Corporation | 707 | −7 | 1.5% |
| Zing Health Consolidator, Inc | 337 | +27 | 0.7% |
| Molina Healthcare, Inc. | 156 | +63 | 0.3% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 95 | −6 | 0.2% |
| Longevity Health Founders, LLC | 85 | −32 | 0.2% |
| Elevance Health, Inc. | 38 | −1 | under 0.1% |
| Union Health Services, Inc. | 12 | +1 | under 0.1% |
| Lumeris Group Holdings Corporation | 11 | new | 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, 22,171 beneficiaries in Lake County were assigned to 168 Medicare Shared Savings Program ACOs, 35.1% of assignable Original Medicare beneficiaries. Together, roughly 58% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.