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

William Ryan Foster, MD

Individual provider Anesthesiology Physician · NPI 1093204174

William Ryan Foster, MD practises Anesthesiology in Tucson, Arizona. Graduated from New York Medical College in 2018, 8 years ago. Practices with Ias Arizona PLLC, a 127-clinician group and accepts Medicare assignment. Licensed in Arizona and California.

Years since qualifying
8
Trained at
New York Medical College
Licensed in
AZ, CA
In the registry since
2018
Specialties on file
3
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

5301 E Grant Rd
Tucson, AZ 85712-2874
Phone: (520) 324-2030
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence 165371 (CA)
Anesthesiology Physician Taxonomy 207L00000X · Licence 65774 (AZ)
Internal Medicine Physician Taxonomy 207R00000X · Licence R76655 (AZ)

Record details

NPI number1093204174
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMay 4, 2018
Last updated in NPPESOctober 3, 2025
Certification dateOctober 3, 2025

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolNEW YORK MEDICAL COLLEGE
Graduated 2018 (8 years in practice)
Group practice Ias Arizona Pllc — 127 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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 patients169
Services billed 211 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 Ias Arizona PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 127 clinicians in the practice; 11 are shown here.

Other providers in Tucson