Medicare Advantage in Marion County, Florida
85,857 people in Marion County, Florida were enrolled in Medicare Advantage in October 2026, 60.9% of 140,953 eligible beneficiaries (+0.5 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 35% of reported enrollment; 20 parent organizations have 11 or more members and the HHI is 2,433 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 11,180 members here are in plans that terminate or leave the county. MA plans offered go from 55 to 51.
Parent organizations in Marion County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 29,794 | −485 | 34.8% |
| Humana Inc. | 26,008 | +2,425 | 30.4% |
| Elevance Health, Inc. | 12,353 | −579 | 14.4% |
| Guidewell Mutual Holding Corporation | 5,233 | −673 | 6.1% |
| CVS Health Corporation | 5,082 | −124 | 5.9% |
| Ultimate Healthcare Holdings, LLC | 3,306 | +2,463 | 3.9% |
| Devoted Health, Inc. | 1,210 | +426 | 1.4% |
| Centene Corporation | 1,083 | −162 | 1.3% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 882 | −92 | 1.0% |
| Health Care Service Corporation | 399 | −85 | 0.5% |
| Highmark Health | 94 | +5 | 0.1% |
| Mitchell Family Office | 31 | new | under 0.1% |
| Lifetime Healthcare, Inc. | 28 | 0 | under 0.1% |
| UMWA Health and Retirement Funds | 28 | +1 | under 0.1% |
| Corewell Health | 27 | +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, 12,388 beneficiaries in Marion County were assigned to 291 Medicare Shared Savings Program ACOs, 29.4% of assignable Original Medicare beneficiaries. Together, roughly 72% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.