Medicare Advantage in Sauk County, Wisconsin
6,220 people in Sauk County, Wisconsin were enrolled in Medicare Advantage in October 2026, 37.8% of 16,442 eligible beneficiaries (−1.8 pts since October 2025). Medica Holding Company is the largest parent organization with 43% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 2,963 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 889 members here are in plans that terminate or leave the county, and Sanford Health, Aspirus, Inc. leave. MA plans offered go from 32 to 21.
Parent organizations in Sauk County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 2,653 | −13 | 43.0% |
| UnitedHealth Group, Inc. | 1,793 | −2 | 29.1% |
| Humana Inc. | 921 | +124 | 14.9% |
| Sanford Health | 343 | +135 | 5.6% |
| Elevance Health, Inc. | 221 | −98 | 3.6% |
| CVS Health Corporation | 85 | +2 | 1.4% |
| Molina Healthcare, Inc. | 76 | +20 | 1.2% |
| Aspirus, Inc. | 45 | new | 0.7% |
| Network Health, Inc. | 19 | new | 0.3% |
| Health Care Service Corporation | 15 | 0 | 0.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 2,319 beneficiaries in Sauk County were assigned to 33 Medicare Shared Savings Program ACOs, 33.3% of assignable Original Medicare beneficiaries. Together, roughly 59% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.