License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. William Mostow:

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Specialties & Research

Dr. William Mostow, MD is board certified in Emergency Medicine.

Education & Awards

Dr. Mostow graduated from Northwestern University, Chicago.


Dr. Mostow has 5 hospital affiliations:

  • Pioneer Valley Hospital 
  • Del E Webb Memorial Hospital 


  • English

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Additional Information
Dr. William Ray Mostow MD is a male Emergency Medicine Specialist, has 22 years of experience and practices in Emergency Medicine.
Where does Dr. William R. Mostow practice?
Dr. William Mostow has 3 office locations.
Dr. William Mostow practices Emergency Medicine near Phoenix, AZ.
Additional practice locations include: Sun City West, AZ and Salt Lake City, UT.
See Phoenix Emergency Physicians.