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

Steven Anthony Siwik, MD

Individual provider Diagnostic Radiology Physician · NPI 1821069089

Steven Anthony Siwik, MD practises Diagnostic Radiology in Tucson, Arizona. Graduated from University of Arizona College of Medicine in 1993, 33 years ago. Practices with Radiology Ltd LLC, a 108-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
33
Trained at
University of Arizona College of Medicine
Licensed in
AZ
In the registry since
2006
Specialties on file
4
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

677 N Wilmot Rd
Tucson, AZ 85711-2701 Not confirmed with CMS for 13 years — call before visiting
Phone: (520) 795-2889
Fax: (520) 795-6321
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence 22916 (AZ)
Vascular & Interventional Radiology Physician Taxonomy 2085R0204X · Licence 22916 (AZ)
Diagnostic Ultrasound Physician Taxonomy 2085U0001X · Licence 22916 (AZ)
Body Imaging Physician Taxonomy 2085B0100X · Licence 22916 (AZ)

Record details

NPI number1821069089
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 27, 2006
Last updated in NPPESFebruary 27, 2013

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolUNIVERSITY OF ARIZONA COLLEGE OF MEDICINE
Graduated 1993 (33 years in practice)
Group practice Radiology Ltd Llc — 108 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 patients2,653
Services billed 22,928 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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 Radiology Ltd LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 108 clinicians in the practice; 12 are shown here.

Other providers in Tucson