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

Dr. Andrea S. Tieng, MD

Individual provider Gastroenterology Physician · NPI 1356528566

Dr. Andrea S. Tieng, MD is a Gastroenterology in Rancho Cucamonga, California. Qualified in 2003, 23 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in California and New York.

Years since qualifying
23
Licensed in
CA, NY
In the registry since
2008
Specialties on file
2
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

10801 Foothill Blvd Ste 106
Rancho Cucamonga, CA 91730-7695
Phone: (909) 255-7200
Fax: (909) 255-7215
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence A106477 (CA)
Gastroenterology Physician Taxonomy 207RG0100X · Licence 241597 (NY)

Record details

NPI number1356528566
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJanuary 30, 2008
Last updated in NPPESJanuary 27, 2022
Certification dateJanuary 27, 2022

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolOTHER
Graduated 2003 (23 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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