Medicare Advantage in Clark County, Wisconsin
4,691 people in Clark County, Wisconsin were enrolled in Medicare Advantage in October 2026, 61.3% of 7,649 eligible beneficiaries (−1.4 pts since October 2025). Sanford Health is the largest parent organization with 76% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 5,869 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 1,251 members here are in plans that terminate or leave the county, and Aspirus, Inc. leaves. MA plans offered go from 23 to 20.
Parent organizations in Clark County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Sanford Health | 3,529 | +198 | 75.6% |
| Humana Inc. | 405 | +210 | 8.7% |
| Elevance Health, Inc. | 309 | −514 | 6.6% |
| UnitedHealth Group, Inc. | 207 | −83 | 4.4% |
| Aspirus, Inc. | 115 | +80 | 2.5% |
| Centene Corporation | 57 | +13 | 1.2% |
| Network Health, Inc. | 17 | new | 0.4% |
| CVS Health Corporation | 15 | +1 | 0.3% |
| Group Health Cooperative of Eau Claire | 11 | new | 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, 287 beneficiaries in Clark County were assigned to 19 Medicare Shared Savings Program ACOs, 13.2% of assignable Original Medicare beneficiaries. Together, roughly 66% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.