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

Eric R Kallwitz, MD

Individual provider Gastroenterology Physician · NPI 1275716607

Eric R Kallwitz, MD practises Gastroenterology in Chicago, Illinois. Graduated from Rush Medical College of Rush University in 2002, 24 years ago. Practices with Loyola University Medical Center, a 946-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
24
Trained at
Rush Medical College of Rush University
Licensed in
IL
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.

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Practice location Address checks out

840 S Wood St Fl 7 MC 716
Chicago, IL 60612-4325
Phone: (312) 996-6651
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 036113292 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 036113292 (IL)

Record details

NPI number1275716607
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedDecember 7, 2007
Last updated in NPPESJanuary 31, 2023
Certification dateJanuary 31, 2023

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Also practisesINTERNAL MEDICINE
Medical schoolRUSH MEDICAL COLLEGE OF RUSH UNIVERSITY
Graduated 2002 (24 years in practice)
Group practice Loyola University Medical Center — 946 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 patients426
Services billed 941 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

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 Loyola University Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 946 clinicians in the practice; 12 are shown here.

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