Dr. Olwen M. Hahn, MD

Dr. Hahn practices at The University of Chicago Medical Center in Chicago, Illinois.

Dr. Hahn's NPI, 1992823611, was assigned on March 27, 2007. Dr. Hahn graduated from Emory School of Medicine in 2001.

Dr. Hahn's primary practice is The University of Chicago Medical Center, at 5841 S Maryland Ave, Chicago, IL 60637 in Cook County. The practice phone is (773) 702-1530.

Dr. Hahn's primary practice is The University of Chicago Medical Center in Chicago, Illinois. Dr. Hahn is also affiliated with University of Chicago Medical Center. The medical group on file is UChicago Medicine Physicians. Dmand AI also links Dr. Hahn to 1 more medical group, named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hahn practices. Vendor and product names are available with a free account.

Hematology and oncology is Dr. Hahn's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Hahn is board certified in internal medicine by the American Board of Internal Medicine. Dr. Hahn has a license on file in Illinois.

Dmand AI lists breast cancer and chronic leukemia among the conditions Dr. Hahn treats.

CMS data shows 202 Medicare services from Dr. Hahn across 3 procedure codes in 2024, for 89 Medicare patients. Medicare paid $14,314 for them. Every service was in a facility, such as a hospital, rather than an office.

CMS counts 89 Medicare patients who saw Dr. Hahn in 2024. The largest group is 65 to 74, with 42 patients. 75% of them have cancer, and 70% have high blood pressure. 19% are also on Medicaid. Their average risk score is 1.69, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Hahn's median patient age at 68, with 94% women.

In 2024, Dr. Hahn wrote 394 Medicare Part D claims for 86 patients. 76% of them were for generic drugs. CMS names the drug for 273 of them, across 8 drugs with 11 or more claims each, at $543,778 in total drug cost.

Dr. Hahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Hahn as offering telehealth.

Dmand AI links 59 papers to Dr. Hahn, published from 2012 to 2025. 2021 was the busiest year, with 10. The most frequent topics are Breast Neoplasms, Antineoplastic Combined Chemotherapy Protocols and Neoadjuvant Therapy. Dr. Hahn has published most often in J Clin Oncol. Dr. Hahn's most frequent co-authors are Eric J. Small, MD, Michael Morris, MD and Rita Nanda.

Dmand AI links Dr. Hahn to 12 clinical trials, 7 of them phase 3 studies. 8 are still active or recruiting. Conditions studied include Breast Neoplasms, Breast Diseases and Brain Neoplasms. Alliance for Clinical Trials in Oncology sponsors the most, 4.

CMS Open Payments shows 12 general payments to Dr. Hahn from 2 drug and device companies from 2024 to 2025. Travel and lodging make up the largest share, 59% of the total. AstraZeneca Pharmaceuticals LP paid the most, $1,737.

Dmand AI lists 1 award for Dr. Hahn, most recently CMS Stage 1 EHR in 2013.

Dr. Hahn graduated from Emory School of Medicine in 2001. Dr. Hahn is a member of ASCO.

Dr. Hahn is in network with 9 carriers, including Aetna, Blue Cross Blue Shield of Michigan and HCSC. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.