Medicare Advantage in Walworth County, Wisconsin
12,226 people in Walworth County, Wisconsin were enrolled in Medicare Advantage in October 2026, 46.4% of 26,330 eligible beneficiaries (−0.5 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 50% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 3,560 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 1,826 members here are in plans that terminate or leave the county. MA plans offered go from 22 to 18.
Parent organizations in Walworth County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 6,089 | +614 | 50.0% |
| Humana Inc. | 3,685 | +1,251 | 30.3% |
| Elevance Health, Inc. | 1,304 | −303 | 10.7% |
| CVS Health Corporation | 460 | −1,111 | 3.8% |
| Centene Corporation | 430 | +328 | 3.5% |
| Health Care Service Corporation | 92 | −9 | 0.8% |
| Network Health, Inc. | 64 | +29 | 0.5% |
| Molina Healthcare, Inc. | 24 | new | 0.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 16 | 0 | 0.1% |
| Medica Holding Company | 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, 7,642 beneficiaries in Walworth County were assigned to 71 Medicare Shared Savings Program ACOs, 75.9% of assignable Original Medicare beneficiaries. Together, roughly 87% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.