Medicare Advantage in Jefferson County, Florida
2,753 people in Jefferson County, Florida were enrolled in Medicare Advantage in October 2026, 64.1% of 4,294 eligible beneficiaries (+0.01 pts since October 2025). Guidewell Mutual Holding Corporation is the largest parent organization with 44% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 3,530 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 559 members here are in plans that terminate or leave the county, and Centene Corporation leaves. MA plans offered go from 21 to 17.
Parent organizations in Jefferson County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Guidewell Mutual Holding Corporation | 1,192 | +88 | 43.8% |
| UnitedHealth Group, Inc. | 960 | +61 | 35.3% |
| Humana Inc. | 523 | +41 | 19.2% |
| Centene Corporation | 36 | −105 | 1.3% |
| Elevance Health, Inc. | 12 | 0 | 0.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 235 beneficiaries in Jefferson County were assigned to 29 Medicare Shared Savings Program ACOs, 24.0% of assignable Original Medicare beneficiaries. Together, roughly 73% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.