Medicare Advantage in Union County, South Dakota
1,287 people in Union County, South Dakota were enrolled in Medicare Advantage in October 2026, 32.7% of 3,937 eligible beneficiaries (−2.3 pts since October 2025). CVS Health Corporation is the largest parent organization with 54% of reported enrollment; 4 parent organizations have 11 or more members and the HHI is 4,047 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 84 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 14 to 12.
Parent organizations in Union County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 682 | +124 | 54.2% |
| Medica Holding Company | 401 | +105 | 31.9% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 89 | −70 | 7.1% |
| UnitedHealth Group, Inc. | 87 | −150 | 6.9% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,205 beneficiaries in Union County were assigned to 29 Medicare Shared Savings Program ACOs, 64.8% of assignable Original Medicare beneficiaries. Together, roughly 76% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.