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

Individual provider Internal Medicine Physician · NPI 1164507869

Ray Hsiao, MD is an Internal Medicine in Hacienda Heights, California. Graduated from University of California, San Diego School of Medicine in 1989, 37 years ago. Accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
37
Trained at
University of California, San Diego School of Medicine
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

1850 S Azusa Ave Ste 308
Hacienda Heights, CA 91745-6813
Phone: (626) 854-7866
Fax: (626) 820-0666
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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 G70571 (CA)

Record details

NPI number1164507869
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 25, 2006
Last updated in NPPESJuly 9, 2007

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 1989 (37 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

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