Medicare Advantage in Harrison County, Iowa
1,128 people in Harrison County, Iowa were enrolled in Medicare Advantage in October 2026, 30.3% of 3,723 eligible beneficiaries (−1.0 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 30% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 1,794 (moderately concentrated). HRSA classifies the county as fully rural. For 2027, 326 members here are in plans that terminate or leave the county, and Blue Cross Blue Shield of Michigan Mutual Ins. Co., Medica Holding Company leave. MA plans offered go from 20 to 14.
Parent organizations in Harrison County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 328 | −94 | 29.7% |
| Humana Inc. | 205 | +18 | 18.6% |
| Centene Corporation | 192 | +85 | 17.4% |
| CVS Health Corporation | 136 | −74 | 12.3% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 86 | −4 | 7.8% |
| Devoted Health, Inc. | 64 | new | 5.8% |
| Elevance Health, Inc. | 38 | −20 | 3.4% |
| Medica Holding Company | 29 | 0 | 2.6% |
| Mitchell Family Office | 14 | +1 | 1.3% |
| Immanuel | 13 | −2 | 1.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,903 beneficiaries in Harrison County were assigned to 22 Medicare Shared Savings Program ACOs, 92.0% of assignable Original Medicare beneficiaries. Together, roughly 94% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.