Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Ronald Sierzenski, MD

Individual provider Emergency Medicine Physician · NPI 1861428633

Dr. Ronald Sierzenski, MD is an Emergency Medicine in Chandler, Arizona. Graduated from Jefferson Medical College of Thomas Jefferson University in 1997, 29 years ago. Practices with Valley Hyperbarics LLC, a 6-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
29
Trained at
Jefferson Medical College of Thomas Jefferson University
Licensed in
AZ
In the registry since
2006
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

475 S Dobson Rd
Chandler, AZ 85224-5605
Phone: (480) 963-4561
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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 28468 (AZ)
Emergency Medical Services (Emergency Medicine) Physician Taxonomy 207PE0004X · Licence 28468 (AZ)
Undersea and Hyperbaric Medicine (Emergency Medicine) Physician Taxonomy 207PE0005X · Licence 28468 (AZ)

Record details

NPI number1861428633
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 24, 2006
Last updated in NPPESApril 22, 2010

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolJEFFERSON MEDICAL COLLEGE OF THOMAS JEFFERSON UNIVERSITY
Graduated 1997 (29 years in practice)
Group practice Valley Hyperbarics Llc — 6 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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