Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Theresa Thanh Ngoc Nguyen, MD

Individual provider Internal Medicine Physician · NPI 1003893801

Theresa Thanh Ngoc Nguyen, MD is an Internal Medicine in Santa Ana, California. Graduated from University of California, San Diego School of Medicine in 1995, 31 years ago. Practices with Theresa Thanh Ngoc Nguyen MD Inc, a 2-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
31
Trained at
University of California, San Diego School of Medicine
Licensed in
CA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

5030 Westminster Ave
Santa Ana, CA 92703-1151
Phone: (714) 775-8090
Fax: (657) 251-0494
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence A61129 (CA)

Record details

NPI number1003893801
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 22, 2005
Last updated in NPPESJuly 20, 2026
Certification dateJuly 20, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, SAN DIEGO SCHOOL OF MEDICINE
Graduated 1995 (31 years in practice)
Group practice Theresa Thanh Ngoc Nguyen Md Inc — 2 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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