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

Dr. Katayoun Rezai, MD

Individual provider Internal Medicine Physician · NPI 1730111576

Dr. Katayoun Rezai, MD is registered under Infectious Disease in Chicago, Illinois. Graduated from Rush Medical College of Rush University in 1998, 28 years ago. Practices with Cook County, a 787-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
28
Trained at
Rush Medical College of Rush University
Licensed in
IL
In the registry since
2006
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

1901 W Harrison St
Chicago, IL 60612-3714
Phone: (312) 864-6000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Infectious Disease Physician (primary) Taxonomy 207RI0200X · Licence 036104419 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 036-104419 (IL)

Record details

NPI number1730111576
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 6, 2006
Last updated in NPPESApril 28, 2021
Certification dateApril 28, 2021

Medicare enrollment

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

Medicare specialtyINFECTIOUS DISEASE
Also practisesINTERNAL MEDICINE
Medical schoolRUSH MEDICAL COLLEGE OF RUSH UNIVERSITY
Graduated 1998 (28 years in practice)
Group practice Cook County — 787 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of tissue 1–10 times
Removal or shaving of skin growth 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients26
Services billed 48 a service is one billed item, such as a visit, a test or a procedure
Average patient age63

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 Cook County

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 787 clinicians in the practice; 12 are shown here.

Other providers in Chicago