Medicare Advantage in Plymouth County, Iowa
1,700 people in Plymouth County, Iowa were enrolled in Medicare Advantage in October 2026, 28.1% of 6,044 eligible beneficiaries (−1.3 pts since October 2025). CVS Health Corporation is the largest parent organization with 51% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 3,435 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 446 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 14.
Parent organizations in Plymouth County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 868 | −40 | 51.4% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 430 | +117 | 25.5% |
| Humana Inc. | 140 | +36 | 8.3% |
| UnitedHealth Group, Inc. | 116 | −183 | 6.9% |
| Medica Holding Company | 79 | +59 | 4.7% |
| Iowa Health System | 22 | +6 | 1.3% |
| Mitchell Family Office | 20 | −1 | 1.2% |
| Elevance Health, Inc. | 13 | −19 | 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, 2,409 beneficiaries in Plymouth County were assigned to 21 Medicare Shared Savings Program ACOs, 74.0% of assignable Original Medicare beneficiaries. Together, roughly 81% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.