Medicare Advantage in Warren County, Iowa
4,926 people in Warren County, Iowa were enrolled in Medicare Advantage in October 2026, 42.4% of 11,627 eligible beneficiaries (−0.9 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 36% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 2,748 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,298 members here are in plans that terminate or leave the county, and Blue Cross Blue Shield of Michigan Mutual Ins. Co. leaves. MA plans offered go from 24 to 25.
Parent organizations in Warren County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,781 | −397 | 36.3% |
| CVS Health Corporation | 1,654 | +265 | 33.7% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 704 | +3 | 14.4% |
| Humana Inc. | 341 | +89 | 7.0% |
| Trinity Health Corporation | 263 | +105 | 5.4% |
| Centene Corporation | 94 | +61 | 1.9% |
| Mitchell Family Office | 42 | +5 | 0.9% |
| Elevance Health, Inc. | 22 | −16 | 0.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 3,905 beneficiaries in Warren County were assigned to 36 Medicare Shared Savings Program ACOs, 78.8% of assignable Original Medicare beneficiaries. Together, roughly 88% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.