Medicare Advantage in Clay County, South Dakota
777 people in Clay County, South Dakota were enrolled in Medicare Advantage in October 2026, 33.4% of 2,324 eligible beneficiaries (−1.2 pts since October 2025). Medica Holding Company is the largest parent organization with 44% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 2,789 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 200 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 16 to 14.
Parent organizations in Clay County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 337 | +118 | 44.2% |
| CVS Health Corporation | 146 | −45 | 19.1% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 123 | −4 | 16.1% |
| Sanford Health | 82 | +30 | 10.7% |
| UnitedHealth Group, Inc. | 75 | −93 | 9.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 329 beneficiaries in Clay County were assigned to 14 Medicare Shared Savings Program ACOs, 32.9% of assignable Original Medicare beneficiaries. Together, roughly 55% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.