Medicare Advantage in Tazewell County, Illinois
14,216 people in Tazewell County, Illinois were enrolled in Medicare Advantage in October 2026, 45.4% of 31,296 eligible beneficiaries (+0.2 pts since October 2025). Humana Inc. is the largest parent organization with 40% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 2,996 (highly concentrated). For 2027, 2,180 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 26 to 20.
Parent organizations in Tazewell County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 5,705 | +900 | 40.3% |
| CVS Health Corporation | 4,702 | +99 | 33.2% |
| UnitedHealth Group, Inc. | 1,992 | −210 | 14.1% |
| Centene Corporation | 1,117 | +245 | 7.9% |
| Molina Healthcare, Inc. | 437 | −64 | 3.1% |
| Health Care Service Corporation | 199 | −68 | 1.4% |
| OSF Healthcare System | 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, 8,264 beneficiaries in Tazewell County were assigned to 59 Medicare Shared Savings Program ACOs, 61.9% of assignable Original Medicare beneficiaries. Together, roughly 79% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.