Medicare Advantage in Gregory County, South Dakota
248 people in Gregory County, South Dakota were enrolled in Medicare Advantage in October 2026, 20.5% of 1,209 eligible beneficiaries (−1.5 pts since October 2025). Medica Holding Company is the largest parent organization with 87% of reported enrollment; 2 parent organizations have 11 or more members and the HHI is 7,676 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 13 members here are in plans that terminate or leave the county, and CVS Health Corporation leaves. MA plans offered go from 11 to 6.
Parent organizations in Gregory County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 200 | +13 | 86.6% |
| CVS Health Corporation | 31 | −28 | 13.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 342 beneficiaries in Gregory County were assigned to 7 Medicare Shared Savings Program ACOs, 46.9% of assignable Original Medicare beneficiaries. Together, roughly 58% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.