Medicare Advantage in Colleton County, South Carolina
5,443 people in Colleton County, South Carolina were enrolled in Medicare Advantage in October 2026, 50.5% of 10,771 eligible beneficiaries (+0.6 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 41% of reported enrollment; 11 parent organizations have 11 or more members and the HHI is 2,956 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 36 members here are in plans that terminate or leave the county. MA plans offered go from 44 to 47.
Parent organizations in Colleton County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 2,230 | −372 | 41.3% |
| Humana Inc. | 1,802 | +211 | 33.4% |
| Devoted Health, Inc. | 424 | +301 | 7.9% |
| CVS Health Corporation | 352 | −24 | 6.5% |
| Centene Corporation | 196 | −12 | 3.6% |
| Health Care Service Corporation | 196 | +53 | 3.6% |
| Clover Health Holdings, Inc. | 76 | +34 | 1.4% |
| UNICO Services, Inc. | 48 | +3 | 0.9% |
| Molina Healthcare, Inc. | 42 | −10 | 0.8% |
| Independence Health Group, Inc. | 19 | −3 | 0.4% |
| Elevance Health, Inc. | 12 | +1 | 0.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,523 beneficiaries in Colleton County were assigned to 34 Medicare Shared Savings Program ACOs, 38.1% of assignable Original Medicare beneficiaries. Together, roughly 69% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.