Medicare Advantage in Jefferson County, Wisconsin
8,847 people in Jefferson County, Wisconsin were enrolled in Medicare Advantage in October 2026, 44.4% of 19,933 eligible beneficiaries (−1.1 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 46% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 2,920 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 1,248 members here are in plans that terminate or leave the county. MA plans offered go from 28 to 24.
Parent organizations in Jefferson County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 4,046 | +104 | 46.0% |
| Humana Inc. | 1,786 | +254 | 20.3% |
| Medica Holding Company | 1,431 | +26 | 16.3% |
| Elevance Health, Inc. | 947 | −269 | 10.8% |
| Centene Corporation | 323 | +193 | 3.7% |
| Molina Healthcare, Inc. | 132 | +2 | 1.5% |
| CVS Health Corporation | 70 | 0 | 0.8% |
| Network Health, Inc. | 69 | +45 | 0.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 4,131 beneficiaries in Jefferson County were assigned to 59 Medicare Shared Savings Program ACOs, 53.5% 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.