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

Dr. Stefan Loy Zimmerman, MD

Individual provider Diagnostic Radiology Physician · NPI 1184773004

Dr. Stefan Loy Zimmerman, MD practises Diagnostic Radiology in Baltimore, Maryland. Graduated from Perelman School of Med at the University of Pennsylvania in 2004, 22 years ago. Practices with Johns Hopkins University, a 2,855-clinician group. Licensed in Maryland and Pennsylvania.

Years since qualifying
22
Trained at
Perelman School of Med at the University of Pennsylvania
Licensed in
MD, PA
In the registry since
2007
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

600 N Wolfe St Dept OF Radiology
Baltimore, MD 21287-0005
Phone: (410) 955-6500
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence D0069425 (MD)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence MD437001 (PA)

Record details

NPI number1184773004
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 9, 2007
Last updated in NPPESOctober 27, 2018

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolPERELMAN SCHOOL OF MED AT THE UNIVERSITY OF PENNSYLVANIA
Graduated 2004 (22 years in practice)
Group practice Johns Hopkins University — 2855 clinicians
Accepts Medicare assignment Not indicated
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 patients1,642
Services billed 23,852 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

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 Johns Hopkins University

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2855 clinicians in the practice; 12 are shown here.

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