Medicare Advantage in Oneida County, Wisconsin
6,899 people in Oneida County, Wisconsin were enrolled in Medicare Advantage in October 2026, 50.4% of 13,692 eligible beneficiaries (−1.6 pts since October 2025). Sanford Health is the largest parent organization with 47% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 2,977 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 1,874 members here are in plans that terminate or leave the county, and Aspirus, Inc. leaves. MA plans offered go from 20 to 17.
Parent organizations in Oneida County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Sanford Health | 3,220 | +83 | 46.9% |
| UnitedHealth Group, Inc. | 1,381 | −270 | 20.1% |
| Humana Inc. | 1,109 | +621 | 16.2% |
| Aspirus, Inc. | 549 | +334 | 8.0% |
| Elevance Health, Inc. | 442 | −852 | 6.4% |
| CVS Health Corporation | 139 | +3 | 2.0% |
| Health Care Service Corporation | 23 | −3 | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 228 beneficiaries in Oneida County were assigned to 41 Medicare Shared Savings Program ACOs, 4.5% of assignable Original Medicare beneficiaries. Together, roughly 53% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.