Medicare Advantage in Corson County, South Dakota
129 people in Corson County, South Dakota were enrolled in Medicare Advantage in October 2026, 21.3% of 605 eligible beneficiaries (−2.3 pts since October 2025). Medica Holding Company is the largest parent organization with 39% of reported enrollment; 3 parent organizations have 11 or more members and the HHI is 3,386 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 36 members here are in plans that terminate or leave the county, and CVS Health Corporation leaves. MA plans offered go from 14 to 5.
Parent organizations in Corson County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 49 | +8 | 39.2% |
| UnitedHealth Group, Inc. | 39 | −10 | 31.2% |
| CVS Health Corporation | 37 | 0 | 29.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 97 beneficiaries in Corson County were assigned to 8 Medicare Shared Savings Program ACOs, 34.9% of assignable Original Medicare beneficiaries. Together, roughly 49% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.