Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Ythanh Duy Nguyen, MD

Individual provider Internal Medicine Physician · NPI 1255391181

Dr. Ythanh Duy Nguyen, MD is an Internal Medicine in Rancho Cucamonga, California. Qualified in 2002, 24 years ago. Practices with Premier Medical Group of California, a 3-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
24
Licensed in
CA
In the registry since
2006
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

8235 Rochester Ave
Rancho Cucamonga, CA 91730-0718
Phone: (909) 484-4900
Fax: (909) 781-2949
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 999 San Bernardino Rd, Upland, CA 91786-4920 — (562) 236-3432

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence A84989 (CA)

Record details

NPI number1255391181
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedMarch 24, 2006
Last updated in NPPESDecember 14, 2025
Certification dateDecember 14, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2002 (24 years in practice)
Group practice Premier Medical Group Of California — 3 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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