Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alex P Diaz De Villalvilla, MD

Internal Medicine Physician in Providence, RI · enumerated 2008.

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

National Provider Identifier

1548422074

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Registry record

Entity type Individual (Type 1)

Name Alex P Diaz De Villalvilla

Credential MD

Sex Male

Practice address 593 Eddy St, Apc 5, Providence, RI, 02903

Phone (401) 444-4741

Fax (401) 444-4445

Enumeration date Jun 26, 2008

Last updated in NPPES Jun 12, 2012

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD13891 (RI) Primary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License MD13891 (RI) Secondary

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 specialty is Alex Diaz De Villalvilla?

Alex Diaz De Villalvilla is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-06-12.