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

Individual provider Hematology & Oncology Physician · NPI 1992823611

Dr. Olwen M Hahn, MD is a Hematology/Oncology in Chicago, Illinois. Graduated from Emory University School of Medicine in 2001, 25 years ago. Practices with University of Chicago, a 1,681-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Illinois.

Years since qualifying
25
Trained at
Emory University School of Medicine
Licensed in
IL
In the registry since
2007
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

5841 S Maryland Ave Mc 2115
Chicago, IL 60637-1447
Phone: (773) 702-5381
Fax: (773) 702-3163
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X (IL)

Record details

NPI number1992823611
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedMarch 27, 2007
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolEMORY UNIVERSITY SCHOOL OF MEDICINE
Graduated 2001 (25 years in practice)
Group practice University Of Chicago — 1681 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

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