Medicare Advantage in Jefferson County, Iowa
2,224 people in Jefferson County, Iowa were enrolled in Medicare Advantage in October 2026, 45.5% of 4,892 eligible beneficiaries (−0.9 pts since October 2025). Humana Inc. is the largest parent organization with 27% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 2,128 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 768 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 16 to 13.
Parent organizations in Jefferson County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 586 | +364 | 26.8% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 575 | +38 | 26.3% |
| Centene Corporation | 432 | +386 | 19.7% |
| CVS Health Corporation | 296 | −148 | 13.5% |
| UnitedHealth Group, Inc. | 267 | −674 | 12.2% |
| Elevance Health, Inc. | 34 | −16 | 1.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 221 beneficiaries in Jefferson County were assigned to 25 Medicare Shared Savings Program ACOs, 10.2% of assignable Original Medicare beneficiaries. Together, roughly 51% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.