Medicare Advantage in Buffalo County, Wisconsin
1,457 people in Buffalo County, Wisconsin were enrolled in Medicare Advantage in October 2026, 38.9% of 3,743 eligible beneficiaries (−1.7 pts since October 2025). Sanford Health is the largest parent organization with 36% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 2,233 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 339 members here are in plans that terminate or leave the county, and Medica Holding Company leaves. MA plans offered go from 26 to 19.
Parent organizations in Buffalo County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Sanford Health | 522 | +56 | 36.5% |
| University of Wisconsin Hospitals and Clincs Autho | 291 | +24 | 20.4% |
| Humana Inc. | 197 | −14 | 13.8% |
| Medica Holding Company | 188 | +176 | 13.2% |
| UnitedHealth Group, Inc. | 129 | −89 | 9.0% |
| Elevance Health, Inc. | 89 | −197 | 6.2% |
| Group Health Cooperative of Eau Claire | 13 | new | 0.9% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,318 beneficiaries in Buffalo County were assigned to 13 Medicare Shared Savings Program ACOs, 75.3% of assignable Original Medicare beneficiaries. Together, roughly 85% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.