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PATRICK S O'HOLLAREN MD
NPI 1891782868
Urology - Pediatric Urology in Portland, OR

Active since October 04, 2005PECOS Enrolled
9427 SW BARNES RD STE 395, PORTLAND, OR 97225(503) 216-6050 Get Directions Write a Review

NPPES record last updated: January 19, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jan 19, 2021, Apr 3, 2019, Sep 18, 2018 (3 updates tracked since 2018).

About Patrick S O'hollaren Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

PATRICK S O'HOLLAREN MD (NPI 1891782868) is an individual pediatric urology provider in Portland, Oregon, licensed in Oregon (MD18712) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1891782868
Entity TypeIndividualMale
Primary Taxonomy2088P0231X
Provider Legal NamePATRICK S O'HOLLARENCredential: MD
Location Address9427 SW BARNES RD STE 395Portland, OR 97225-6652
Mailing AddressPo Box 3158Portland, OR 97208-3158
Phone(503) 216-6050
Sole ProprietorNo
Enumeration DateOctober 4, 2005
Last NPPES UpdateJanuary 19, 20213 updates tracked since enumeration
NPPES CertifiedJanuary 19, 2021
✔ NPI 1891782868 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyUrology · Pediatric UrologyAllopathic & Osteopathic Physicians
Taxonomy Code2088P0231X
License✔ Licensed in OR · MD18712
Definition
Surgeons who can diagnose, treat, and manage children's urinary and genital problems. A pediatric urologist devotes a minimum of 50% of his or her practice to the urologic problems of infants, children, and adolescents. Pediatric urologists generally provide the following services: the evaluation and management of voiding disorders; vesicoureteral reflux, and urinary tract infections that require surgery; surgical reconstruction of the urinary tract (kidneys, ureters, and bladder) including genital abnormalities, hypospadias, and intersex conditions; surgery for groin conditions in childhood and adolescence (undescended testes, hydrocele/hernia, varicocele).
9427 SW BARNES RD STE 395, Portland, OR 97225
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Other Identifiers 10

Other930766376Careoregon
MedicaidMD8720RAK
Other003395010Blue Cross
OtherF81042Providence Health
Medicaid8156036WA
Other0565AHealthnet
Other8156036Columbia United Pf
Medicaid0034023ID
OtherA016Tricare
Medicaid64795OR

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Patrick S O'hollaren Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Patrick O'hollaren reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Providence Health & Services - Oregon
Same address
Pediatrics
9427 SW BARNES RD, SUITE 598
Portland, OR 97225
  • Reassigned Medicare billing, Oregon enrollment
  • 1,501 clinicians in this Medicare group
NPI 1033299458 (503) 216-8654
Providence Health & Services - Oregon
0.1 mi
General Acute Care Hospital
9205 SW BARNES RD
Portland, OR 97225
  • Reassigned Medicare billing, Oregon enrollment
  • 753 clinicians in this Medicare group
NPI 1114015971 (503) 451-3000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

TYSON DEE PAYNE PAYNE PSYD
Psychologist (Clinical)
9427 SW BARNES RD STE 395
PORTLAND, OR 97225
Washington County (503) 216-6550
VICTORIA EUGENIE JANSEN RD
Dietitian, Registered
9427 SW BARNES RD STE 395
PORTLAND, OR 97225
Washington County (503) 216-6050
MISS NICOLE ASHLEIGH DALTON PSYD
Psychologist (Clinical)
9427 SW BARNES RD STE 395
PORTLAND, OR 97225
Washington County (503) 216-6550
ANGELA ELAINE SANTIAGO LENNON MD
Pediatrics (Pediatric Endocrinology)
9427 SW BARNES RD STE 395
PORTLAND, OR 97225
Washington County (503) 216-6050
GILLIAN C ROSICKY
Nurse Practitioner (Family)
9427 SW BARNES RD STE 395
PORTLAND, OR 97225
Washington County (503) 216-6550
PROVIDENCE HEALTH & SERVICES - OREGON
Psychiatry & Neurology (Neurology with Special Qualifications in Child Neurology)
9427 SW BARNES RD STE 395
PORTLAND, OR 97225
Washington County (503) 216-1280
AUSTIN D LAYTON DO
Psychiatry & Neurology (Neurology with Special Qualifications in Child Neurology)
9427 SW BARNES RD STE 395
PORTLAND, OR 97225
Washington County (503) 216-6050
MR. RENJITH RADHAKRISHNAN NAIR AGACNP
Nurse Practitioner (Acute Care)
9427 SW BARNES RD STE 395
PORTLAND, OR 97225
Washington County (503) 962-1000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Patrick O'hollaren's NPI number?

The NPI number for Patrick O'hollaren is 1891782868. It was assigned to this individual provider in the NPPES registry on October 4, 2005.

Where is Patrick O'hollaren located?

Patrick O'hollaren practices at 9427 SW Barnes Rd Ste 395, Portland, OR 97225. The listed phone number is (503) 216-6050.

What is Patrick O'hollaren's specialty?

The primary specialty registered for this NPI is Urology, specializing in Pediatric Urology, with taxonomy code 2088P0231X.

Is Patrick O'hollaren enrolled in Medicare?

Yes. Patrick O'hollaren is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Patrick O'hollaren's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Patrick O'hollaren reassigns Medicare benefits to 2 organizations: Providence Health & Services - Oregon (Portland, OR) and Providence Health & Services - Oregon (Portland, OR). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Patrick O'hollaren's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Patrick O'hollaren accept?

Health plans from Providence Health Plan list Patrick O'hollaren as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Patrick O'hollaren was last updated on January 19, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.