Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jose Valentin Diaz, D.O.

Surgery Physician in West Islip, NY · enumerated 2011.

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

National Provider Identifier

1740564533

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Registry record

Entity type Individual (Type 1)

Name Dr. Jose Valentin Diaz

Credential D.O.

Sex Male

Practice address 1000 Montauk Hwy, West Islip, NY, 11795

Phone (631) 465-6343

Enumeration date Sep 28, 2011

Last updated in NPPES Aug 23, 2018

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 294195 (NY) Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License LT18018 (ME) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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

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.

What specialty is Jose Diaz?

Jose Diaz is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-08-23.