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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.

THERESA THANH NGOC NGUYEN, MD, INC.
NPI 1750667192
Internal Medicine in Santa Ana, CA

Active since October 31, 2011
5030 WESTMINSTER AVE, SANTA ANA, CA 92703(714) 775-8090(657) 251-0494 Get Directions Write a Review

NPPES record last updated: July 20, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Theresa Thanh Ngoc Nguyen, Md, Inc. NPPES

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

THERESA THANH NGOC NGUYEN, MD, INC. (NPI 1750667192) is a healthcare organization registered as an internal medicine in Santa Ana, California and active in the NPI registry since October 2011. The organization lists Theresa Thanh Ngoc Nguyen, Physician In Charge, as its authorized official.

NPPES Registry Identity

NPI1750667192
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameTHERESA THANH NGOC NGUYEN, MD, INC.
Location Address5030 WESTMINSTER AVESanta Ana, CA 92703-1151
Mailing Address5030 Westminster AveSanta Ana, CA 92703-1151 · (714) 775-8090 · Fax (657) 251-0494
Phone(714) 775-8090
Fax(657) 251-0494
Organization SubpartNo
Authorized OfficialTheresa Thanh Ngoc NguyenPhysician In Charge · (714) 775-8090
Enumeration DateOctober 31, 2011
Last NPPES UpdateJuly 20, 2026
NPPES CertifiedJuly 20, 2026
✔ NPI 1750667192 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A61129
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
5030 WESTMINSTER AVE, Santa Ana, CA 92703
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

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.

THERESA THANH NGOC NGUYEN M.D.
Internal Medicine
5030 WESTMINSTER AVE
SANTA ANA, CA 92703
Orange County (714) 775-8090
TAM THI MINH NGUYEN
Nurse Practitioner (Women's Health)
5030 WESTMINSTER AVE
SANTA ANA, CA 92703
Orange County (714) 775-8090
THAI DINH NGUYEN M.D.
Internal Medicine
5030 WESTMINSTER AVE
SANTA ANA, CA 92703
Orange County (714) 775-8090

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 Theresa Thanh Ngoc Nguyen, MD, Inc.'s NPI number?

The NPI number for Theresa Thanh Ngoc Nguyen, MD, Inc. is 1750667192. It was assigned to this organization in the NPPES registry on October 31, 2011.

Where is Theresa Thanh Ngoc Nguyen, MD, Inc. located?

Theresa Thanh Ngoc Nguyen, MD, Inc. is located at 5030 Westminster Ave, Santa Ana, CA 92703. The listed phone number is (714) 775-8090.

What is Theresa Thanh Ngoc Nguyen, MD, Inc.'s specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for Theresa Thanh Ngoc Nguyen, MD, Inc. was last updated on July 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 26 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.