Medicare Advantage in Brown County, South Dakota
2,533 people in Brown County, South Dakota were enrolled in Medicare Advantage in October 2026, 29.1% of 8,705 eligible beneficiaries (+0.8 pts since October 2025). Medica Holding Company is the largest parent organization with 90% of reported enrollment; 3 parent organizations have 11 or more members and the HHI is 8,270 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 56 members here are in plans that terminate or leave the county. MA plans offered go from 9 to 7.
Parent organizations in Brown County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 2,276 | +441 | 90.5% |
| UnitedHealth Group, Inc. | 225 | −223 | 8.9% |
| CVS Health Corporation | 14 | −3 | 0.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 2,937 beneficiaries in Brown County were assigned to 34 Medicare Shared Savings Program ACOs, 63.2% of assignable Original Medicare beneficiaries. Together, roughly 74% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.