Quick answers
- Where does William N. Marrero see patients?
- Medicare's clinician data lists 2 practice locations, including Carolina, PR. Call before your visit to confirm the address.
- What is William N. Marrero's specialty?
- Medicare lists General Practice as the primary specialty.
- Does William N. Marrero accept Medicare assignment?
- Yes. Medicare's clinician data says William N. Marrero accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William N. Marrero?
- (787) 789-1996, as listed in official Medicare / NPI Registry data.
- What is William N. Marrero's NPI number?
- 1396356549. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where William N. Marrero is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Carr, Suite 190Carolina, PR 00983 (787) 789‑1996
- Carr 190, 8 Sabana AbajoCarolina, PR 00983 (787) 789‑1996
Group practices
Medicare enrollment lists William N. Marrero as a member of this group (CMS data updated 2026-10-02).
- Clinica Las Americas Guaynabo, Inc51 clinicians in the group
Specialties
- General Practiceprimary
Other general practitioners in Carolina
Clinicians with the same Medicare primary specialty in Carolina, PR — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2013 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1396356549 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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