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

Dr. John Dawson Mason, MD

Individual provider Emergency Medicine Physician · NPI 1023090099

Dr. John Dawson Mason, MD is an Emergency Medicine in Tempe, Arizona. Qualified in 2000, 26 years ago. Practices with Usacs Emergency Medicine of Arizona LLC, a 40-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
26
Licensed in
AZ
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

1500 S Mill Ave
Tempe, AZ 85281-6699
Phone: (480) 784-5533
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 31338 (AZ)

Record details

NPI number1023090099
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 16, 2005
Last updated in NPPESApril 18, 2019
Mailing address4619 E Calle Tuberia, Phoenix, AZ 85018-2910

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2000 (26 years in practice)
Group practice Usacs Emergency Medicine Of Arizona Llc — 40 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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