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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DUY NGUYEN
NPI 1639788425
Psychiatry & Neurology - Psychiatry in San Mateo, CA

Active since July 28, 2020PECOS Enrolled
999 BAKER WAY STE 150, SAN MATEO, CA 94404(855) 501-1004 Get Directions Write a Review

NPPES record last updated: August 25, 2026. Verified against the NPPES registry weekly; last sync: August 30, 2026.

Record update history: Aug 25, 2026, Jan 30, 2026, Nov 14, 2024 and 1 more (4 updates tracked since 2020).

About Duy Nguyen NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DUY NGUYEN (NPI 1639788425) is an individual psychiatry provider in San Mateo, California, licensed in California (A188952) and active in the NPI registry since July 2020. He is enrolled in Medicare PECOS and maintains a secondary practice location in Fresno.

NPPES Registry Identity

NPI1639788425
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameDUY NGUYEN
Location Address999 BAKER WAY STE 150San Mateo, CA 94404-1581
Mailing Address904 87th StDaly City, CA 94015-3630 · (279) 204-5314
Phone(855) 501-1004
Sole ProprietorNo
Enumeration DateJuly 28, 2020
Last NPPES UpdateAugust 25, 20264 updates tracked since enumeration
NPPES CertifiedAugust 25, 2026
✔ NPI 1639788425 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in CA · A188952
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
999 BAKER WAY STE 150, San Mateo, CA 94404
Open in Google Maps ↗

Secondary Practice Location 1

Location 1155 N Fresno StFresno, CA 93701-2302 · Phone (279) 204-5314

Other Identifiers 1

Other10533CA · Medical License (physician And Surgeon A)

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Duy Nguyen is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94404 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$202.35 typical visit price
range $69.00 – $202.35
Typical copayment $50.58 (range $17.25 – $50.58)
Most-billed visit code 99205
Established Patient
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ANN G EDWARDS MFT
Marriage & Family Therapist
999 BAKER WAY STE 150
SAN MATEO, CA 94404
San Mateo County (855) 501-1004
MUKUND JAYANT PRABAKAR MD
Psychiatry & Neurology (Psychiatry)
999 BAKER WAY STE 150
SAN MATEO, CA 94404
San Mateo County (855) 501-1004
BENJAMIN ANJO PMHNP-BC
Nurse Practitioner (Psychiatric/Mental Health)
999 BAKER WAY STE 150
SAN MATEO, CA 94404
San Mateo County (855) 501-1004

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Duy Nguyen's NPI number?

The NPI number for Duy Nguyen is 1639788425. It was assigned to this individual provider in the NPPES registry on July 28, 2020.

Where is Duy Nguyen located?

Duy Nguyen practices at 999 Baker Way Ste 150, San Mateo, CA 94404. The listed phone number is (855) 501-1004.

What is Duy Nguyen's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Duy Nguyen enrolled in Medicare?

Yes. Duy Nguyen is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Duy Nguyen was last updated on August 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.