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

Matthew James Mason, MD

Individual provider Emergency Medicine Physician · NPI 1487116281

Matthew James Mason, MD practises Emergency Medicine in San Diego, California. Qualified in 2019, 7 years ago. Practices with Regents of the University of California, a 37-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
7
Licensed in
CA
In the registry since
2019
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

200 W Arbor Dr
San Diego, CA 92103-9000
Phone: (800) 926-8273
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 1415 Ross Ave, El Centro, CA 92243-4306 — (760) 339-7100
  • 800 W Valley Pkwy Ste 100, Escondido, CA 92025-2557 — (800) 797-2050

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence A179571 (CA)

Record details

NPI number1487116281
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 2, 2019
Last updated in NPPESMay 2, 2024
Certification dateMay 2, 2024

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2019 (7 years in practice)
Group practice Regents Of The University Of California — 37 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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 patients175
Services billed 209 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

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.

Colleagues at Regents of the University of California

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 37 clinicians in the practice; 12 are shown here.

Other providers in San Diego