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Dr. William Omar Marrero Ortiz, MD

Geriatric Medicine (Internal Medicine) Physician in San Juan, PR · enumerated 2017 · practices at Pabon Dermatology, LLC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1619418027

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Registry record

Entity type Individual (Type 1)
Name Dr. William Omar Marrero Ortiz
Credential MD
Sex Male
Practice address 735 Ave Ponce De Leon Ste 415, San Juan, PR, 00917
Phone (787) 768-9813
Enumeration date Mar 17, 2017
Last updated in NPPES May 24, 2024

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 23096 (PR) Secondary
207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 23096 (PR) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Where does William Marrero Ortiz practice?
The practice location on file with NPPES is in San Juan, PR. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for William Marrero Ortiz?
The National Provider Identifier (NPI) for William Marrero Ortiz is 1619418027, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-24.