Medicare Advantage in Polk County, Iowa
40,609 people in Polk County, Iowa were enrolled in Medicare Advantage in October 2026, 44.3% of 91,741 eligible beneficiaries (−0.5 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 37% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 2,759 (highly concentrated). For 2027, 8,701 members here are in plans that terminate or leave the county, and Blue Cross Blue Shield of Michigan Mutual Ins. Co., Molina Healthcare, Inc. leave. MA plans offered go from 24 to 25.
Parent organizations in Polk County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 15,118 | −3,187 | 37.3% |
| CVS Health Corporation | 13,735 | +2,569 | 33.9% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 4,294 | −210 | 10.6% |
| Humana Inc. | 3,539 | +482 | 8.7% |
| Trinity Health Corporation | 1,624 | +514 | 4.0% |
| Centene Corporation | 1,123 | +642 | 2.8% |
| Elevance Health, Inc. | 436 | −344 | 1.1% |
| Molina Healthcare, Inc. | 349 | new | 0.9% |
| Immanuel | 184 | +10 | 0.5% |
| Mitchell Family Office | 90 | +27 | 0.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 26,900 beneficiaries in Polk County were assigned to 109 Medicare Shared Savings Program ACOs, 73.2% of assignable Original Medicare beneficiaries. Together, roughly 85% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.