Medicare Advantage in Winnebago County, Wisconsin
27,618 people in Winnebago County, Wisconsin were enrolled in Medicare Advantage in October 2026, 70.7% of 39,073 eligible beneficiaries (−0.2 pts since October 2025). Network Health, Inc. is the largest parent organization with 50% of reported enrollment; 11 parent organizations have 11 or more members and the HHI is 3,398 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 833 members here are in plans that terminate or leave the county, and Sanford Health, CareSource leave. MA plans offered go from 40 to 33.
Parent organizations in Winnebago County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Network Health, Inc. | 13,935 | +3,142 | 50.5% |
| UnitedHealth Group, Inc. | 6,509 | −2,248 | 23.6% |
| Humana Inc. | 4,472 | +902 | 16.2% |
| Elevance Health, Inc. | 1,007 | −1,028 | 3.7% |
| Centene Corporation | 640 | +210 | 2.3% |
| CVS Health Corporation | 515 | −64 | 1.9% |
| HealthPartners, Inc. | 353 | −199 | 1.3% |
| Sanford Health | 68 | +24 | 0.2% |
| Molina Healthcare, Inc. | 35 | +10 | 0.1% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 29 | +2 | 0.1% |
| CareSource | 11 | −5 | under 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 5,981 beneficiaries in Winnebago County were assigned to 46 Medicare Shared Savings Program ACOs, 76.6% of assignable Original Medicare beneficiaries. Together, roughly 93% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.