Medicare Advantage in Boone County, Iowa
2,237 people in Boone County, Iowa were enrolled in Medicare Advantage in October 2026, 33.8% of 6,622 eligible beneficiaries (−1.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 27% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 2,144 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 376 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 23 to 25.
Parent organizations in Boone County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 590 | −416 | 26.6% |
| CVS Health Corporation | 577 | −64 | 26.0% |
| Humana Inc. | 494 | +227 | 22.3% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 337 | +73 | 15.2% |
| Trinity Health Corporation | 100 | +71 | 4.5% |
| Centene Corporation | 84 | +60 | 3.8% |
| Mitchell Family Office | 20 | 0 | 0.9% |
| Elevance Health, Inc. | 18 | 0 | 0.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,339 beneficiaries in Boone County were assigned to 27 Medicare Shared Savings Program ACOs, 38.7% of assignable Original Medicare beneficiaries. Together, roughly 59% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.