Medicare Advantage in Grant County, South Dakota
1,127 people in Grant County, South Dakota were enrolled in Medicare Advantage in October 2026, 53.9% of 2,092 eligible beneficiaries (+0.5 pts since October 2025). Medica Holding Company is the largest parent organization with 98% of reported enrollment; 2 parent organizations have 11 or more members and the HHI is 9,576 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 13 members here are in plans that terminate or leave the county. MA plans offered go from 8 to 6.
Parent organizations in Grant County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 1,083 | +67 | 97.8% |
| UnitedHealth Group, Inc. | 24 | +4 | 2.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 500 beneficiaries in Grant County were assigned to 15 Medicare Shared Savings Program ACOs, 64.2% of assignable Original Medicare beneficiaries. Together, roughly 83% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.