Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Tien Nguyen, D.M.D.

General Practice Dentistry in Livermore, CA · enumerated 2007.

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

National Provider Identifier

1649309436

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Registry record

Entity type Individual (Type 1)

Name Dr. John Tien Nguyen

Credential D.M.D.

Sex Male

Practice address 955 Bluebell Dr, Livermore, CA, 94551

Phone (992) 596-1110

Fax (925) 961-1126

Enumeration date Mar 5, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 50962 (CA) Primary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD credential

Other identifiers

Identifier	Type	State	Issuer
G93352-01	Other	CA	DENTI-CAL PROVIDER NUMBER

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

How do I verify John Nguyen's NPI record?

Cross-check NPI 1649309436 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1649309436 active?

Yes, as of the latest NPPES snapshot, NPI 1649309436 is active (record last updated 2007-07-08).

Other providers at this practice address

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Elizabeth Nguyen General Practice Dentistry · Livermore, CA NPI 1619006400

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