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

Mason Shieh, MD, MBA

Individual provider Emergency Medicine Physician · NPI 1467718486

Mason Shieh, MD, MBA is an Emergency Medicine in Los Alamitos, California. Graduated from University of California, Irvine, California College of Medicine in 2012, 14 years ago. Practices with Regents of the University Of, a 125-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
14
Trained at
University of California, Irvine, California College of Medicine
Licensed in
CA
In the registry since
2012
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
MBA — Master of Business Administration
A graduate business degree.

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Practice location Address checks out

3751 Katella Ave
Los Alamitos, CA 90720-3113
Phone: (714) 456-8888
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1115 S Sunset Ave, West Covina, CA 91790-3940 — (626) 962-4011

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence A134394 (CA)

Record details

NPI number1467718486
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , MBA
Sole proprietorNo
NPI enumeratedApril 3, 2012
Last updated in NPPESApril 2, 2025
Certification dateApril 2, 2025

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, IRVINE, CALIFORNIA COLLEGE OF MEDICINE
Graduated 2012 (14 years in practice)
Group practice Regents Of The University Of — 125 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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