Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Diem D Nguyen, MD

Q: What is the NPI number for Diem Nguyen?

The National Provider Identifier (NPI) for Diem Nguyen is 1609858018, a Type 1 (individual) record in the CMS NPPES registry.

Family Medicine Physician in Williamsburg, VA · enumerated 2005.

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

National Provider Identifier

1609858018

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Registry record

Entity type Individual (Type 1)

Name Dr. Diem D Nguyen

Credential MD

Sex Male

Practice address Eastern State Hospital 4601 Ironbound Rd., Williamsburg, VA, 23187

Phone (757) 253-7434

Fax (757) 253-4564

Enumeration date Nov 19, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License VA01010411157 (VA) 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 Diem Nguyen?

The National Provider Identifier (NPI) for Diem Nguyen is 1609858018, a Type 1 (individual) record in the CMS NPPES registry.

Where does Diem Nguyen practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.