Medicare Advantage in Sumter County, Florida
51,375 people in Sumter County, Florida were enrolled in Medicare Advantage in October 2026, 57.2% of 89,858 eligible beneficiaries (−0.5 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 52% of reported enrollment; 19 parent organizations have 11 or more members and the HHI is 3,233 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 2,927 members here are in plans that terminate or leave the county. MA plans offered go from 52 to 48.
Parent organizations in Sumter County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 26,636 | −1,419 | 52.0% |
| Humana Inc. | 8,860 | +2,869 | 17.3% |
| Guidewell Mutual Holding Corporation | 5,437 | −380 | 10.6% |
| CVS Health Corporation | 4,014 | +324 | 7.8% |
| Elevance Health, Inc. | 3,667 | −32 | 7.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 1,050 | −36 | 2.0% |
| Ultimate Healthcare Holdings, LLC | 692 | +536 | 1.4% |
| Devoted Health, Inc. | 218 | +60 | 0.4% |
| Centene Corporation | 189 | −22 | 0.4% |
| Health Care Service Corporation | 159 | −31 | 0.3% |
| Highmark Health | 150 | +15 | 0.3% |
| CareFirst, Inc. | 32 | +17 | under 0.1% |
| Lifetime Healthcare, Inc. | 29 | +3 | under 0.1% |
| Horizon Mutual Holdings, Inc | 24 | +13 | under 0.1% |
| California Physicians' Service | 20 | −2 | 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, 13,247 beneficiaries in Sumter County were assigned to 309 Medicare Shared Savings Program ACOs, 39.4% of assignable Original Medicare beneficiaries. Together, roughly 74% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.