Medicare Advantage in St. Tammany, Louisiana
39,284 people in St. Tammany, Louisiana were enrolled in Medicare Advantage in October 2026, 61.8% of 63,555 eligible beneficiaries (−0.1 pts since October 2025). Humana Inc. is the largest parent organization with 41% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 3,326 (highly concentrated). For 2027, 9,132 members here are in plans that terminate or leave the county. MA plans offered go from 30 to 26.
Parent organizations in St. Tammany
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 16,178 | +2,277 | 41.3% |
| UnitedHealth Group, Inc. | 14,739 | −377 | 37.6% |
| Louisiana Health Service & Indemnity Company | 5,150 | +1,190 | 13.1% |
| CVS Health Corporation | 2,306 | −24 | 5.9% |
| Centene Corporation | 367 | +4 | 0.9% |
| Elevance Health, Inc. | 221 | +44 | 0.6% |
| Mitchell Family Office | 101 | +25 | 0.3% |
| Curana Health Holdings, LLC | 101 | new | 0.3% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 20 | +1 | under 0.1% |
| Health Care Service Corporation | 16 | +1 | 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, 9,194 beneficiaries in St. Tammany were assigned to 81 Medicare Shared Savings Program ACOs, 57.2% of assignable Original Medicare beneficiaries. Together, roughly 84% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.