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

Individual provider Emergency Medicine Physician · NPI 1922057348

William Ray Mostow, MD practises Emergency Medicine in Sun City, Arizona. Graduated from Northwestern University Feinberg Medical School in 1989, 37 years ago. Practices with Cep America- Arizona, PC, a 88-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
37
Trained at
Northwestern University Feinberg Medical School
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

14502 W Meeker Blvd
Sun City, AZ 85375 Not confirmed with CMS for 17 years — call before visiting
Phone: (623) 214-4000
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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 26337 (AZ)

Record details

NPI number1922057348
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 10, 2006
Last updated in NPPESJanuary 14, 2009

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 1989 (37 years in practice)
Group practice Cep America- Arizona, Pc — 88 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 patients701
Services billed 1,083 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

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 Cep America- Arizona, PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 88 clinicians in the practice; 12 are shown here.

Other providers in Sun City