Medicare Advantage in Day County, South Dakota
576 people in Day County, South Dakota were enrolled in Medicare Advantage in October 2026, 34.5% of 1,670 eligible beneficiaries (−3.7 pts since October 2025). Medica Holding Company is the largest parent organization with 76% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 5,980 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 233 members here are in plans that terminate or leave the county, and Blue Cross Blue Shield of Michigan Mutual Ins. Co., CVS Health Corporation leave. MA plans offered go from 12 to 7.
Parent organizations in Day County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 434 | −9 | 76.4% |
| Sanford Health | 42 | +21 | 7.4% |
| UnitedHealth Group, Inc. | 32 | −24 | 5.6% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 30 | −4 | 5.3% |
| CVS Health Corporation | 30 | −3 | 5.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 232 beneficiaries in Day County were assigned to 14 Medicare Shared Savings Program ACOs, 30.0% of assignable Original Medicare beneficiaries. Together, roughly 54% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.