Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Dr. Gerald Brian Holtz, MD

Individual provider Diagnostic Radiology Physician · NPI 1578649554

Dr. Gerald Brian Holtz, MD practises Diagnostic Radiology in Naperville, Illinois. Graduated from Northwestern University Feinberg Medical School in 1968, 58 years ago. Practices with Hanford Community Hospital, a 60-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
58
Trained at
Northwestern University Feinberg Medical School
Licensed in
IL
In the registry since
2006
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

705 S Sleight St
Naperville, IL 60540-6628 Not confirmed with CMS for 15 years — call before visiting
Phone: (630) 903-4520
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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 36-44766 (IL)

Record details

NPI number1578649554
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 31, 2006
Last updated in NPPESJanuary 6, 2011

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 1968 (58 years in practice)
Group practice Hanford Community Hospital — 60 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations9 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 patients981
Services billed 1,223 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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. Those with a page here are linked.

Colleagues at Hanford Community Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 60 clinicians in the practice; 12 are shown here.

Other providers in Naperville