John Dawson Mason, MD
Emergency Medicine Physician · Tempe, AZ
John Dawson Mason, MD is an emergency medicine physician with a practice address in Tempe, Arizona, and NPI 1023090099, issued on Nov 16, 2005. Check the license (Arizona 31338, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- John Dawson Mason
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 31338 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 1500 S Mill Ave, Tempe, AZ 85281
- Phone
- (480) 784-5533
- Enumerated
- Nov 16, 2005
- Record last updated
- Apr 18, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicaid ID
- 775471 AZ
- Medicare enrollment
- Enrolled (PECOS I20040223000552); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,494 in Arizona → Look up another NPI →
Also registered at 1500 S Mill Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mazi Condelee, CRNACertified Registered Nurse Anesthetist1568132975
- Lisa Dewinter, MDEmergency Medical Services (Emergency Medicine) Physician1407803117
- Andrew Dybala, PA-CPhysician Assistant1366622672
- Robert Hepburn, DOEmergency Medicine Physician1790859221
- Chris Hinson Md, MDEmergency Medicine Physician1588751085
- Landon HitchcockCertified Registered Nurse Anesthetist1093398224
Verify John Dawson Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 31338Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
69% fewer Medicare Part D claims than the average emergency medicine physician in 2024
70 Medicare Part D claims for 55 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 3 group practices
- East Valley EP PLLCGilbert, AZ
- Tec Emergency Physicians OF Arizona, LLCMesa, AZ
- Usacs Emergency Medicine OF Arizona LLCFlorence, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Dawson Mason among 1,494 emergency medicine physician records in Arizona
John Dawson Mason, MD is one of 1,494 emergency medicine physician records with a practice address in Arizona. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2000 · median 2014 among the 828 with a school on file
- Record last updated2019 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in Arizona
There are 1,494 emergency medicine physician records in Arizona.
All 1,494 in Arizona → Every provider in Tempe → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Harold Cohen, M.D.Tempe, AZ 852811710948534
- Robert Hepburn, DOTempe, AZ 852811790859221
- Chris Hinson Md, MDTempe, AZ 852811588751085
- Mark Mathurin, MDTempe, AZ 852811497853733
- Thuan Nguyen, MDTempe, AZ 852811184722480
- Kevin O'Mara, MDTempe, AZ 852811578675245
- Perry Olliver, DOTempe, AZ 852811285377531
- Stefanie Schroeder, M.D.Tempe, AZ 852811346201571
Common questions
What is John Dawson Mason, MD's NPI number?
John Dawson Mason, MD's National Provider Identifier (NPI) is 1023090099, issued on Nov 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John Dawson Mason, MD located?
The NPPES record lists a practice address at 1500 S Mill Ave, Tempe, AZ, 85281. Phone: (480) 784-5533. Providers update this record themselves, so call before visiting.
How can I verify John Dawson Mason, MD's license?
NPPES lists Arizona license number 31338, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Dawson Mason, MD prescribe under Medicare Part D?
In 2024, John Dawson Mason, MD had 70 Medicare Part D claims for 55 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.