Medicare Advantage in Martin County, Florida
21,673 people in Martin County, Florida were enrolled in Medicare Advantage in October 2026, 40.9% of 52,976 eligible beneficiaries (−0.2 pts since October 2025). Humana Inc. is the largest parent organization with 48% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 3,314 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,454 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 40 to 33.
Parent organizations in Martin County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 10,407 | +1,071 | 48.2% |
| UnitedHealth Group, Inc. | 6,123 | −253 | 28.4% |
| CVS Health Corporation | 2,664 | −154 | 12.3% |
| Guidewell Mutual Holding Corporation | 962 | −359 | 4.5% |
| Elevance Health, Inc. | 408 | +20 | 1.9% |
| Centene Corporation | 361 | −29 | 1.7% |
| Devoted Health, Inc. | 321 | +194 | 1.5% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 159 | −13 | 0.7% |
| Health Care Service Corporation | 73 | −130 | 0.3% |
| Gold Kidney Health Plan | 53 | +41 | 0.2% |
| Highmark Health | 27 | +9 | 0.1% |
| Horizon Mutual Holdings, Inc | 15 | new | 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, 12,659 beneficiaries in Martin County were assigned to 235 Medicare Shared Savings Program ACOs, 50.4% of assignable Original Medicare beneficiaries. Together, roughly 71% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.