Medicare Advantage in Butte County, South Dakota
1,141 people in Butte County, South Dakota were enrolled in Medicare Advantage in October 2026, 42.9% of 2,659 eligible beneficiaries (−7.2 pts since October 2025). Medica Holding Company is the largest parent organization with 56% of reported enrollment; 3 parent organizations have 11 or more members and the HHI is 4,196 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 381 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 8 to 5.
Parent organizations in Butte County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 629 | +158 | 56.1% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 319 | −40 | 28.5% |
| UnitedHealth Group, Inc. | 173 | −76 | 15.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 812 beneficiaries in Butte County were assigned to 15 Medicare Shared Savings Program ACOs, 87.0% of assignable Original Medicare beneficiaries. Together, roughly 93% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.