Medicare Advantage in San Sebastian, Puerto Rico
10,013 people in San Sebastian, Puerto Rico were enrolled in Medicare Advantage in October 2026, 89.1% of 11,233 eligible beneficiaries (+0.7 pts since October 2025). MHH Healthcare, L.P. is the largest parent organization with 69% of reported enrollment; 3 parent organizations have 11 or more members and the HHI is 5,327 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 22 to 23.
Parent organizations in San Sebastian
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| MHH Healthcare, L.P. | 6,930 | −53 | 69.4% |
| Guidewell Mutual Holding Corporation | 1,995 | +530 | 20.0% |
| Elevance Health, Inc. | 1,062 | −207 | 10.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 0 beneficiaries in San Sebastian were assigned to 0 Medicare Shared Savings Program ACOs, 0.0% of assignable Original Medicare beneficiaries. Together, roughly 89% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.