Medicare Advantage in Union County, South Carolina
4,689 people in Union County, South Carolina were enrolled in Medicare Advantage in October 2026, 60.6% of 7,741 eligible beneficiaries (+0.7 pts since October 2025). Humana Inc. is the largest parent organization with 34% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 2,140 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 37 to 38.
Parent organizations in Union County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 1,573 | +444 | 33.7% |
| UnitedHealth Group, Inc. | 932 | −466 | 20.0% |
| Devoted Health, Inc. | 710 | +404 | 15.2% |
| Centene Corporation | 671 | −144 | 14.4% |
| Health Care Service Corporation | 580 | +126 | 12.4% |
| CVS Health Corporation | 138 | −261 | 3.0% |
| Independence Health Group, Inc. | 33 | −7 | 0.7% |
| Molina Healthcare, Inc. | 27 | +8 | 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, 1,824 beneficiaries in Union County were assigned to 12 Medicare Shared Savings Program ACOs, 76.3% of assignable Original Medicare beneficiaries. Together, roughly 91% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.