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

Individual provider Diagnostic Radiology Physician · NPI 1255313318

Alexander J Chien, MD is a Diagnostic Radiology in Pomona, California. Graduated from University of Michigan Medical School in 1997, 29 years ago. Practices with Darin Rentz DO PC, a 134-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
29
Trained at
University of Michigan Medical School
Licensed in
CA
In the registry since
2005
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

1798 N Garey Ave
Pomona, CA 91767
Phone: (909) 865-9500
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence A82949 (CA)

Record details

NPI number1255313318
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 15, 2005
Last updated in NPPESJuly 13, 2026

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolUNIVERSITY OF MICHIGAN MEDICAL SCHOOL
Graduated 1997 (29 years in practice)
Group practice Darin Rentz Do Pc — 134 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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