Medicare Advantage in Portage County, Wisconsin
9,174 people in Portage County, Wisconsin were enrolled in Medicare Advantage in October 2026, 54.6% of 16,800 eligible beneficiaries (−1.7 pts since October 2025). Sanford Health is the largest parent organization with 42% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 2,498 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 2,181 members here are in plans that terminate or leave the county, and Aspirus, Inc., Centene Corporation leave. MA plans offered go from 32 to 31.
Parent organizations in Portage County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Sanford Health | 3,811 | +175 | 41.8% |
| Humana Inc. | 1,767 | +685 | 19.4% |
| UnitedHealth Group, Inc. | 1,466 | −514 | 16.1% |
| Aspirus, Inc. | 632 | +361 | 6.9% |
| Network Health, Inc. | 582 | +95 | 6.4% |
| CVS Health Corporation | 349 | +211 | 3.8% |
| Elevance Health, Inc. | 349 | −1,055 | 3.8% |
| Centene Corporation | 170 | +36 | 1.9% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 279 beneficiaries in Portage County were assigned to 49 Medicare Shared Savings Program ACOs, 4.8% of assignable Original Medicare beneficiaries. Together, roughly 57% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.