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DR. JUSTIN STEPHEN TREAT DO
NPI 1801826516
Allergy & Immunology in Portland, OR

Active since July 05, 2006PECOS EnrolledAccepts Medicare Assignment
3600 N INTERSTATE AVE, PORTLAND, OR 97227(503) 612-3375(503) 612-3376 Get Directions Write a Review

NPPES record last updated: April 20, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 20, 2022, Feb 4, 2022 (2 updates tracked since 2022).

About Dr. Justin Stephen Treat Do NPPES

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

DR. JUSTIN STEPHEN TREAT DO (NPI 1801826516) is an individual allergy & immunology provider in Portland, Oregon, licensed in Oregon (DO26495) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of Arizona College Of Osteopathic Medicine Mid Western University (2003).

NPPES Registry Identity

NPI1801826516
Entity TypeIndividualMale
Primary Taxonomy207K00000X
Provider Legal NameDR. JUSTIN STEPHEN TREATCredential: DO
Location Address3600 N INTERSTATE AVEPortland, OR 97227-1106
Mailing Address3600 N Interstate AvePortland, OR 97227-1106 · (503) 612-3375 · Fax (503) 612-3376
Phone(503) 612-3375
Fax(503) 612-3376
Sole ProprietorNo
Medical School CMSArizona College Of Osteopathic Medicine Mid Western UniversityGraduated 2003
Enumeration DateJuly 5, 2006
Last NPPES UpdateApril 20, 20222 updates tracked since enumeration
NPPES CertifiedApril 20, 2022
✔ NPI 1801826516 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code207K00000X
License✔ Licensed in OR · DO26495
Definition
An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.
3600 N INTERSTATE AVE, Portland, OR 97227
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Kaiser Permanente.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Justin Stephen Treat Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8426054958
PECOS Enrollment IDI20061006000007
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 Reassignment

Medicare enrollment records show Justin Treat reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Kaiser Foundation Health Plan Of The Northwest
Same address
Oncology, Radiation
3620 N INTERSTATE AVE
Portland, OR 97227
  • Reassigned Medicare billing, Oregon and Washington enrollments
  • Also billed through NPI 1184786527 (Washington)
  • 3,207 clinicians in this Medicare group
NPI 1093043424 (503) 280-2931

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.

DAVID WEI KUO LIN M.D.
Otolaryngology
3600 N INTERSTATE AVE, INTERSTATE MEDICAL OFFICE CENTRAL
PORTLAND, OR 97227
Multnomah County (503) 331-6085
DR. LYNETTE SANTOS MALIK M.D.
Physical Medicine & Rehabilitation (Sports Medicine)
3600 N INTERSTATE AVE, DEPARTMENT OF PHYSICAL MEDICINE
PORTLAND, OR 97227
Multnomah County (503) 331-3070
DR. RYO A. SHOHARA M.D.
Internal Medicine (Hematology & Oncology)
3600 N INTERSTATE AVE
PORTLAND, OR 97227
Multnomah County (503) 331-6500
JOHANNA R HEYMANN RN, LCSW
Social Worker (Clinical)
3600 N INTERSTATE AVE
PORTLAND, OR 97227
Multnomah County (503) 213-8000
DR. SARI JOUIHAN MS, PHARMD
Pharmacist (Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist)
3600 N INTERSTATE AVE
PORTLAND, OR 97227
Multnomah County (503) 504-4203
THOMAS HUGH GIBBS O.D.
Optometrist
3600 N INTERSTATE AVE
PORTLAND, OR 97227
Multnomah County (503) 249-3449
DR. CATALINA HERNANDEZ TORRES MD
Internal Medicine (Hematology & Oncology)
3600 N INTERSTATE AVE
PORTLAND, OR 97227
Multnomah County (800) 813-2000
ANTONY MATHEW POOTHULLIL MD
Ophthalmology
3600 N INTERSTATE AVE
PORTLAND, OR 97227
Multnomah County (503) 331-6330

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 Justin Treat's NPI number?

The NPI number for Justin Treat is 1801826516. It was assigned to this individual provider in the NPPES registry on July 5, 2006.

Where is Justin Treat located?

Justin Treat practices at 3600 N Interstate Ave, Portland, OR 97227. The listed phone number is (503) 612-3375.

What is Justin Treat's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Is Justin Treat enrolled in Medicare?

Yes. Justin Treat is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Justin Treat's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Justin Treat reassigns Medicare benefits to Kaiser Foundation Health Plan Of The Northwest (Portland, OR). The 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 Justin Treat's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Justin Treat accept?

Health plans from Kaiser Permanente list Justin Treat 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 Justin Treat was last updated on April 20, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.