Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Diane Duyen T Nguyen, DO

Medical Oncology Physician in Mcallen, TX · enumerated 2007 · practices at Physicians Educational Foundation.

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

National Provider Identifier

1023233756

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Registry record

Entity type Individual (Type 1)

Name Diane Duyen T Nguyen

Credential DO

Sex Female

Practice address 205 E Toronto Ave, Mcallen, TX, 78503

Phone (956) 296-3990

Fax (956) 665-6837

Enumeration date Apr 16, 2007

Last updated in NPPES Oct 3, 2024

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License DO1698 (TN) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License M3045 (TX) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License M3045 (TX) 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

Other identifiers

Identifier	Type	State	Issuer
4155051	Other	TN	BCBS OF TN

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 Diane Duyen Nguyen?

The National Provider Identifier (NPI) for Diane Duyen Nguyen is 1023233756, a Type 1 (individual) record in the CMS NPPES registry.

Where does Diane Duyen Nguyen practice?

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

Other providers at this practice address

Browse all →

Andrew Dela Garza Family Medicine Physician · Mcallen, TX NPI 1043265671 Kondapavuluru Chowdary Gastroenterology Physician · Mcallen, TX NPI 1194767541 Charles Austin Family Medicine Physician · Mcallen, TX NPI 1205879590 Oscar Cortes Family Medicine Physician · Mcallen, TX NPI 1164459756 Cynthia Cavazos-Gonzalez Clinical Psychologist · Mcallen, TX NPI 1003825340 Sunand Kallumadanda Family Medicine Physician · Mcallen, TX NPI 1588712848 Physicians Educational Foundation Family Medicine Physician · Mcallen, TX NPI 1184761728 Eric Petersen Family Medicine Physician · Mcallen, TX NPI 1184890543

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-10-03.