Medicare Advantage in Chester County, South Carolina
4,582 people in Chester County, South Carolina were enrolled in Medicare Advantage in October 2026, 55.1% of 8,314 eligible beneficiaries (−0.05 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 42% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 2,534 (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 34 to 35.
Parent organizations in Chester County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,892 | −273 | 41.7% |
| Humana Inc. | 873 | +262 | 19.3% |
| Health Care Service Corporation | 741 | +107 | 16.4% |
| Centene Corporation | 328 | +140 | 7.2% |
| Devoted Health, Inc. | 325 | +234 | 7.2% |
| CVS Health Corporation | 314 | −407 | 6.9% |
| Molina Healthcare, Inc. | 29 | +3 | 0.6% |
| Highmark Health | 15 | 0 | 0.3% |
| Independence Health Group, Inc. | 15 | −3 | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 626 beneficiaries in Chester County were assigned to 22 Medicare Shared Savings Program ACOs, 21.6% of assignable Original Medicare beneficiaries. Together, roughly 65% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.