Medicare Advantage in Montgomery County, Illinois
2,922 people in Montgomery County, Illinois were enrolled in Medicare Advantage in October 2026, 40.3% of 7,246 eligible beneficiaries (+1.2 pts since October 2025). CVS Health Corporation is the largest parent organization with 60% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 4,304 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 46 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 31 to 26.
Parent organizations in Montgomery County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 1,732 | −20 | 60.2% |
| UnitedHealth Group, Inc. | 723 | +69 | 25.1% |
| Humana Inc. | 168 | +66 | 5.8% |
| Centene Corporation | 91 | +28 | 3.2% |
| Molina Healthcare, Inc. | 61 | −9 | 2.1% |
| Devoted Health, Inc. | 56 | +37 | 1.9% |
| UMWA Health and Retirement Funds | 36 | 0 | 1.3% |
| Health Care Service Corporation | 12 | −20 | 0.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 3,104 beneficiaries in Montgomery County were assigned to 22 Medicare Shared Savings Program ACOs, 79.2% of assignable Original Medicare beneficiaries. Together, roughly 88% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.