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

Dr. Claire Thuc Duyen Diep, MD

Individual provider Internal Medicine Physician · NPI 1366508707

Dr. Claire Thuc Duyen Diep, MD practises Internal Medicine in Union City, California. Graduated from Eastern Virginia Medical School in 1994, 32 years ago. Accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
32
Trained at
Eastern Virginia Medical School
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

33509 Western Ave
Union City, CA 94587 Not confirmed with CMS for 19 years — call before visiting
Phone: (510) 441-8081
Fax: (510) 441-8080
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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 A55900 (CA)

Record details

NPI number1366508707
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 29, 2006
Last updated in NPPESJuly 17, 2007

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolEASTERN VIRGINIA MEDICAL SCHOOL
Graduated 1994 (32 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients294
Services billed 1,950 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Washington Hospital Hospital · Fremont, CA · listed as Washington Hospital Cardiology Dept
  • St Rose Hospital Hospital · Hayward, CA

Other providers in Union City