Medicare Advantage in Ziebach County, South Dakota
36 people in Ziebach County, South Dakota were enrolled in Medicare Advantage in October 2026, 17.3% of 208 eligible beneficiaries (−2.7 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 100% of reported enrollment; 1 parent organizations have 11 or more members and the HHI is 10,000 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 11 to 5.
Parent organizations in Ziebach County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 24 | −6 | 100.0% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 31 beneficiaries in Ziebach County were assigned to 6 Medicare Shared Savings Program ACOs, 40.7% 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.