Medicare Advantage in Lyon County, Iowa
508 people in Lyon County, Iowa were enrolled in Medicare Advantage in October 2026, 20.3% of 2,500 eligible beneficiaries (−3.9 pts since October 2025). CVS Health Corporation is the largest parent organization with 40% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 3,175 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 204 members here are in plans that terminate or leave the county. MA plans offered go from 19 to 13.
Parent organizations in Lyon County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 189 | −26 | 39.6% |
| Medica Holding Company | 178 | +57 | 37.3% |
| Sanford Health | 58 | +29 | 12.2% |
| UnitedHealth Group, Inc. | 34 | −52 | 7.1% |
| Humana Inc. | 18 | +2 | 3.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 539 beneficiaries in Lyon County were assigned to 8 Medicare Shared Savings Program ACOs, 37.4% of assignable Original Medicare beneficiaries. Together, roughly 50% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.