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

Dr. Nathan Joseph Siesener, MD

Individual provider Diagnostic Radiology Physician · NPI 1295239804

Dr. Nathan Joseph Siesener, MD is a Diagnostic Radiology in Belleville, Illinois. Graduated from University of Missouri, Columbia School of Medicine in 2018, 8 years ago. Practices with Clinical Radiologists SC, a 32-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
8
Trained at
University of Missouri, Columbia School of Medicine
Licensed in
IL
In the registry since
2018
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

4500 Memorial Dr Dept Radiology
Belleville, IL 62226-5360
Phone: (618) 257-5613
Fax: (314) 454-4641
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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 036164864 (IL)

Record details

NPI number1295239804
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 19, 2018
Last updated in NPPESOctober 21, 2025
Certification dateMarch 28, 2023

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolUNIVERSITY OF MISSOURI, COLUMBIA SCHOOL OF MEDICINE
Graduated 2018 (8 years in practice)
Group practice Clinical Radiologists Sc — 32 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations9 on file with Medicare

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