Medicare Advantage in Winnebago County, Iowa
645 people in Winnebago County, Iowa were enrolled in Medicare Advantage in October 2026, 23.2% of 2,784 eligible beneficiaries (−1.3 pts since October 2025). Trinity Health Corporation is the largest parent organization with 25% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 1,751 (moderately concentrated). HRSA classifies the county as fully rural. For 2027, 149 members here are in plans that terminate or leave the county, and Blue Cross Blue Shield of Michigan Mutual Ins. Co., Medical Associates Clinic, P.C. leave. MA plans offered go from 17 to 22.
Parent organizations in Winnebago County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Trinity Health Corporation | 153 | +92 | 24.6% |
| UnitedHealth Group, Inc. | 122 | −122 | 19.6% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 119 | +17 | 19.1% |
| Centene Corporation | 88 | +60 | 14.1% |
| Humana Inc. | 79 | +2 | 12.7% |
| Medical Associates Clinic, P.C. | 33 | −3 | 5.3% |
| Elevance Health, Inc. | 18 | −2 | 2.9% |
| CVS Health Corporation | 11 | −48 | 1.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 409 beneficiaries in Winnebago County were assigned to 17 Medicare Shared Savings Program ACOs, 28.8% of assignable Original Medicare beneficiaries. Together, roughly 45% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.