What is John Oholleran's specialty?

John Oholleran (NPI 1912007220) is a Medicare-billing provider whose primary specialty is General Surgery in Oregon City, OR.

Where does John Oholleran practice?

John Oholleran practices in Oregon City, OR, based on the location reported in the CMS Medicare provider datasets for NPI 1912007220.

How much does Medicare pay John Oholleran?

John Oholleran (NPI 1912007220) received approximately $20K in total Medicare Part B payments, serving 57 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1912007220

John OholleranMD

PRACTICEWILLAMETTE FALLS HOSPITALSee all providers at this practice →

General SurgeryOregon City, ORI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

Unique beneficiaries

—

Total services

Distinct HCPCS

Medicare payment

$4K

Peer benchmark

Total Medicare services vs. 323 General Surgery providers in OR — below median (cohort median 186).

PRESCRIBING · PART D · 2024

Total Rx claims

Beneficiaries

—

Total drug cost

$109

Distinct drugs

Brand share

100.0%

Top prescribed drugs

Hydrocodone/Acetaminophen19 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 John Oholleran'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). 9 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
OHOLLERAN, MICHAEL	36	108
BURKE, VINCENT	29	73
WHEAT, RICHARD	23	62
George Oldham Emergency Medicine · Redwood City, CA	18	44
Daniel Libke Emergency Medicine · Piedmont, CA	15	34
Scott Sherr Internal Medicine · Wheat Ridge, CO	14	75
Kathryn Hawrylyshyn Anesthesiology · Palo Alto, CA	13	15
Duc Nguyen Orthopedic Surgery · Redwood City, CA	12	44
Carl Tjerandsen Physician Assistant · Redding, CA	11	16

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