Medicare Advantage in Charleston County, South Carolina
31,508 people in Charleston County, South Carolina were enrolled in Medicare Advantage in October 2026, 35.9% of 87,767 eligible beneficiaries (−0.3 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 32% of reported enrollment; 17 parent organizations have 11 or more members and the HHI is 2,122 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,490 members here are in plans that terminate or leave the county. MA plans offered go from 47 to 46.
Parent organizations in Charleston County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 9,924 | −2,643 | 31.7% |
| Humana Inc. | 9,165 | +1,280 | 29.2% |
| BlueCross BlueShield of South Carolina (BCBSSC) | 2,839 | +1,205 | 9.1% |
| Devoted Health, Inc. | 2,727 | +1,772 | 8.7% |
| CVS Health Corporation | 2,401 | −1,826 | 7.7% |
| Centene Corporation | 1,548 | +18 | 4.9% |
| Health Care Service Corporation | 1,269 | +441 | 4.0% |
| Clover Health Holdings, Inc. | 658 | +236 | 2.1% |
| Molina Healthcare, Inc. | 223 | −37 | 0.7% |
| Elevance Health, Inc. | 195 | +1 | 0.6% |
| Independence Health Group, Inc. | 175 | −51 | 0.6% |
| BoldAge PACE, LLC | 72 | +56 | 0.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 66 | −3 | 0.2% |
| Highmark Health | 30 | −3 | under 0.1% |
| Missouri Healthcare Advisors, LLC | 19 | +1 | under 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, 20,064 beneficiaries in Charleston County were assigned to 200 Medicare Shared Savings Program ACOs, 48.8% of assignable Original Medicare beneficiaries. Together, roughly 67% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.