Medicare Advantage in Seminole County, Florida
50,391 people in Seminole County, Florida were enrolled in Medicare Advantage in October 2026, 53.3% of 94,475 eligible beneficiaries (−0.1 pts since October 2025). Humana Inc. is the largest parent organization with 43% of reported enrollment; 17 parent organizations have 11 or more members and the HHI is 2,831 (highly concentrated). For 2027, 12,722 members here are in plans that terminate or leave the county, and Health First Shared Services, Inc. leaves. MA plans offered go from 59 to 46.
Parent organizations in Seminole County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 21,545 | +1,977 | 42.9% |
| UnitedHealth Group, Inc. | 14,375 | −1,011 | 28.6% |
| Elevance Health, Inc. | 5,223 | +494 | 10.4% |
| CVS Health Corporation | 2,939 | −156 | 5.8% |
| Centene Corporation | 2,156 | −305 | 4.3% |
| Health Care Service Corporation | 1,266 | −99 | 2.5% |
| Devoted Health, Inc. | 1,011 | +365 | 2.0% |
| Guidewell Mutual Holding Corporation | 969 | −344 | 1.9% |
| Health First Shared Services, Inc. | 379 | +229 | 0.8% |
| Ultimate Healthcare Holdings, LLC | 123 | +102 | 0.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 108 | 0 | 0.2% |
| Athena Healthcare Holdings, LLC | 50 | +33 | under 0.1% |
| Longevity Health Founders, LLC | 37 | −9 | under 0.1% |
| Gold Kidney Health Plan | 28 | new | under 0.1% |
| Independent Living Systems, LLC | 21 | −15 | 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, 8,420 beneficiaries in Seminole County were assigned to 181 Medicare Shared Savings Program ACOs, 27.2% of assignable Original Medicare beneficiaries. Together, roughly 66% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.