Medicare Advantage in St. Martin, Louisiana
6,501 people in St. Martin, Louisiana were enrolled in Medicare Advantage in October 2026, 52.4% of 12,411 eligible beneficiaries (+0.4 pts since October 2025). Humana Inc. is the largest parent organization with 42% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 3,005 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,415 members here are in plans that terminate or leave the county. MA plans offered go from 26 to 27.
Parent organizations in St. Martin
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 2,724 | +405 | 42.1% |
| UnitedHealth Group, Inc. | 2,035 | −13 | 31.4% |
| Louisiana Health Service & Indemnity Company | 738 | +172 | 11.4% |
| CVS Health Corporation | 615 | −207 | 9.5% |
| Centene Corporation | 316 | −87 | 4.9% |
| Elevance Health, Inc. | 44 | +23 | 0.7% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,979 beneficiaries in St. Martin were assigned to 23 Medicare Shared Savings Program ACOs, 45.4% 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.