Medicare Advantage in Pennington County, South Dakota
9,287 people in Pennington County, South Dakota were enrolled in Medicare Advantage in October 2026, 30.2% of 30,706 eligible beneficiaries (−4.8 pts since October 2025). Medica Holding Company is the largest parent organization with 60% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 4,255 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 2,205 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 Pennington County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 5,532 | +1,694 | 60.2% |
| UnitedHealth Group, Inc. | 1,654 | −1,014 | 18.0% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 1,602 | −633 | 17.4% |
| CVS Health Corporation | 229 | +6 | 2.5% |
| Humana Inc. | 73 | −1,221 | 0.8% |
| Elevance Health, Inc. | 52 | 0 | 0.6% |
| Sanford Health | 41 | +13 | 0.4% |
| Health Care Service Corporation | 11 | −2 | 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 8,494 beneficiaries in Pennington County were assigned to 266 Medicare Shared Savings Program ACOs, 63.6% of assignable Original Medicare beneficiaries. Together, roughly 75% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.