What is Olwen Hahn's specialty?

Olwen Hahn (NPI 1992823611) is a Medicare-billing provider whose primary specialty is Hematology-Oncology in Chicago, IL.

Where does Olwen Hahn practice?

Olwen Hahn practices in Chicago, IL, based on the location reported in the CMS Medicare provider datasets for NPI 1992823611.

How much does Medicare pay Olwen Hahn?

Olwen Hahn (NPI 1992823611) received approximately $17K in total Medicare Part B payments, serving 89 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1992823611

Olwen HahnM.D.

PRACTICEUNIVERSITY OF CHICAGO PHYSICIAN'S GROUPSee all providers at this practice →

Hematology-OncologyChicago, ILI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

122

Unique beneficiaries

—

Total services

202

Distinct HCPCS

Medicare payment

$14K

Peer benchmark

Total Medicare services vs. 444 Hematology-Oncology providers in IL — bottom quintile (cohort median 1,266).

PRESCRIBING · PART D · 2024

Total Rx claims

273

Beneficiaries

—

Total drug cost

$544K

Distinct drugs

Brand share

15.0%

Top prescribed drugs

Anastrozole133 claims

Exemestane26 claims

Tamoxifen Citrate24 claims

Ribociclib Succinate24 claims

Letrozole20 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

Total received

$2K

Payment records

By payment type

Travel and Lodging$1K

Food and Beverage$619

Top paying entities

Travel and Lodging$1K

Food and Beverage$619

REFERRAL NETWORK

Where Olwen Hahn's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 20 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
GREENBERG, BRENT	26	87
Yonglin Pu Diagnostic Radiology · Chicago, IL	19	54
Steven Zangan Diagnostic Radiology · Chicago, IL	19	61
MACMAHON, HEBER	17	103
Daniel Appelbaum Diagnostic Radiology · Chicago, IL	16	66
NPI 1124181631	15	42
Charles Rhee Hospice and Palliative Care · Chicago, IL	15	116
David Schacht Diagnostic Radiology · Chicago, IL	14	61
Karin Dill Diagnostic Radiology · Atlanta, GA	14	53
Joanna Gibbs Physician Assistant · Santa Barbara, CA	14	207
City Of Chicago Ambulance Service Provider · Chicago, IL	14	39
Paul Chang Diagnostic Radiology · Chicago, IL	13	80

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events