Medicare Advantage in Marion County, Iowa
2,733 people in Marion County, Iowa were enrolled in Medicare Advantage in October 2026, 34.0% of 8,042 eligible beneficiaries (−1.0 pts since October 2025). CVS Health Corporation is the largest parent organization with 27% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 1,881 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 817 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 15 to 16.
Parent organizations in Marion County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 731 | −116 | 26.9% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 660 | +80 | 24.3% |
| Humana Inc. | 426 | +174 | 15.7% |
| UnitedHealth Group, Inc. | 324 | −485 | 11.9% |
| Trinity Health Corporation | 279 | +189 | 10.3% |
| Centene Corporation | 222 | +164 | 8.2% |
| Mitchell Family Office | 55 | −1 | 2.0% |
| Elevance Health, Inc. | 18 | −31 | 0.7% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,328 beneficiaries in Marion County were assigned to 29 Medicare Shared Savings Program ACOs, 31.6% of assignable Original Medicare beneficiaries. Together, roughly 55% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.