Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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John William Loewen, MD

Individual provider Emergency Medicine Physician · NPI 1760435960

John William Loewen, MD practises Emergency Medicine in Sun City, Arizona. Graduated from Loma Linda University School of Medicine in 2003, 23 years ago. Practices with San Francisco Emergency Medical Associates, a 72-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
23
Trained at
Loma Linda University School of Medicine
Licensed in
AZ
In the registry since
2006
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

10401 W Thunderbird Blvd
Sun City, AZ 85351 Not confirmed with CMS for 18 years — call before visiting
Phone: (623) 977-7211
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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 33798 (AZ)

Record details

NPI number1760435960
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 18, 2006
Last updated in NPPESFebruary 1, 2008

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolLOMA LINDA UNIVERSITY SCHOOL OF MEDICINE
Graduated 2003 (23 years in practice)
Group practice San Francisco Emergency Medical Associates — 72 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients605
Services billed 1,148 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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 San Francisco Emergency Medical Associates

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 72 clinicians in the practice; 12 are shown here.

Other providers in Sun City