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

William Shun Tzeng, MD

Individual provider Internal Medicine Physician · NPI 1649809385

William Shun Tzeng, MD is an Internal Medicine in Hacienda Heights, California. Graduated from Washington University School of Medicine in 2020, 6 years ago. Practices with Health Alliance Medical Group, a 2-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
6
Trained at
Washington University School of Medicine
Licensed in
CA
In the registry since
2020
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

17170 Colima Rd Ste G
Hacienda Heights, CA 91745-6771
Phone: (626) 965-8202
Fax: (626) 964-9893
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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 A187692 (CA)

Record details

NPI number1649809385
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 4, 2020
Last updated in NPPESSeptember 3, 2025
Certification dateSeptember 3, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolWASHINGTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 2020 (6 years in practice)
Group practice Health Alliance Medical Group — 2 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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