Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Titley Diaz, MD

Student in an Organized Health Care Education/Training Program in Carolina, PR · enumerated 2016.

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

National Provider Identifier

1841747144

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Registry record

Entity type Individual (Type 1)

Name William Titley Diaz

Credential MD

Sex Male

Practice address Hospital Upr Federico Trilla Ave 65 Infanteria, Primer Piso Area Administrativa, Carolina, PR, 00984

Phone (787) 769-4520

Enumeration date Sep 2, 2016

Last updated in NPPES Jun 10, 2025

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 14929I (PR) Secondary

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License 21541 (PR) Secondary

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care · License 21541 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for William Titley Diaz?

The National Provider Identifier (NPI) for William Titley Diaz is 1841747144, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Titley Diaz practice?

The practice location on file with NPPES is in Carolina, PR. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-06-10.