Medicare Advantage in Sumter County, South Carolina
12,364 people in Sumter County, South Carolina were enrolled in Medicare Advantage in October 2026, 50.1% of 24,703 eligible beneficiaries (+0.6 pts since October 2025). Humana Inc. is the largest parent organization with 53% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 3,421 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 31 to 34.
Parent organizations in Sumter County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 6,517 | +1,032 | 53.0% |
| CVS Health Corporation | 2,372 | −490 | 19.3% |
| UnitedHealth Group, Inc. | 1,363 | −256 | 11.1% |
| BlueCross BlueShield of South Carolina (BCBSSC) | 1,244 | +151 | 10.1% |
| Centene Corporation | 521 | +10 | 4.2% |
| Independence Health Group, Inc. | 163 | −29 | 1.3% |
| Molina Healthcare, Inc. | 76 | −2 | 0.6% |
| Missouri Healthcare Advisors, LLC | 37 | +9 | 0.3% |
| Elevance Health, Inc. | 13 | −4 | 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, 2,260 beneficiaries in Sumter County were assigned to 53 Medicare Shared Savings Program ACOs, 24.2% of assignable Original Medicare beneficiaries. Together, roughly 62% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.