What is William O'brien's specialty?

William O'brien (NPI 1831101955) is a Medicare-billing provider whose primary specialty is General Surgery in Aurora, IL.

Where does William O'brien practice?

William O'brien practices in Aurora, IL, based on the location reported in the CMS Medicare provider datasets for NPI 1831101955.

How much does Medicare pay William O'brien?

William O'brien (NPI 1831101955) received approximately $118K in total Medicare Part B payments, serving 517 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1831101955

William O'brienMD

PRACTICEDREYER CLINIC, INCSee all providers at this practice →

General SurgeryAurora, ILI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

688

Unique beneficiaries

—

Total services

706

Distinct HCPCS

Medicare payment

$89K

Peer benchmark

Total Medicare services vs. 756 General Surgery providers in IL — top quintile (cohort median 318).

PRESCRIBING · PART D · 2024

Total Rx claims

Beneficiaries

—

Total drug cost

$235

Distinct drugs

Brand share

100.0%

Top prescribed drugs

Hydrocodone/Acetaminophen63 claims

Acetaminophen With Codeine25 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

REFERRAL NETWORK

Where William O'brien'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). 36 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
PRESENCE CENTRAL AND SUBURBAN HOSPITALS NETWORK	108	175
COPLEY MEMORIAL HOSPITAL, INC.	94	250
Jaskiran Cheema Cardiology · Aurora, IL	50	86
Quest Diagnostics Llc Il Clinical Laboratory · Schaumburg, IL	45	71
Jaweed Sayeed Interventional Cardiology · New Braunfels, TX	44	80
Dave Chua Cardiology · Aurora, IL	40	66
Farah Hussain Cardiology · Aurora, IL	39	85
Dreyer Ambulatory Surgery Center, Llc Ambulatory Surgical Center · Aurora, IL	34	62
City Of Aurora Illinois Ambulance Service Provider · Aurora, IL	25	41
Syed Akbar Diagnostic Radiology · Oak Brook, IL	24	63
Samir Gupta Pathology · Joliet, IL	23	46
James Studlo Diagnostic Radiology · Aurora, IL	23	36

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