Quick answers
- Does Mervin J. De Guzman Diaz accept Medicare assignment?
- Yes. Medicare's clinician data says Mervin J. De Guzman Diaz accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Mervin J. De Guzman Diaz's NPI number?
- 1548876121. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mervin J. De Guzman Diaz works
Medicare's Facility Affiliation Data lists Mervin J. De Guzman Diaz at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Ryder Memorial Hospital IncHumacao, PR · Acute Care Hospital · Emergency services: listed by Medicare · CCN 400007
Practice locations
Addresses where Mervin J. De Guzman Diaz is enrolled with Medicare (CMS data updated October 2, 2026).
- PO Box, Suite 59Fajardo, PR 00738
- Res Jard De Ceiba, IICeiba, PR 00735
Specialties
- General Practiceprimary
Other general practitioners in Fajardo
Clinicians with the same Medicare primary specialty in Fajardo, PR — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2020 (6 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1548876121 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians