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

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