Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. DONALD A. TRELSTAD M.D.
NPI 1962407890
Specialist in Tualatin, OR

Q: What is Donald Trelstad's NPI number?

The NPI number for Donald Trelstad is 1962407890. It was assigned to this individual provider in the NPPES registry on June 16, 2005.

Q: What is Donald Trelstad's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Q: When was this NPI record last updated?

The NPPES record for Donald Trelstad was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 29 days 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.

Active since June 16, 2005

19260 SW 65TH AVE, STE 420, TUALATIN, OR 97062(503) 692-0405(503) 692-7978 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About Dr. Donald A. Trelstad M.d. NPPES

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

DR. DONALD A. TRELSTAD M.D. (NPI 1962407890) is an individual specialist in Tualatin, Oregon, licensed in Oregon (MD09256) and active in the NPI registry since June 2005.

NPPES Registry Identity

NPI1962407890

Entity TypeIndividualMale

Primary Taxonomy174400000X

Provider Legal NameDR. DONALD A. TRELSTADCredential: M.D.

Location Address19260 SW 65TH AVE, STE 420Tualatin, OR 97062-5712

Mailing Address1040 Nw 22nd Ave, Ste 660Portland, OR 97210-3083 · (503) 692-0405 · Fax (503) 692-7978

Phone(503) 692-0405

Fax(503) 692-7978

Sole ProprietorNo

Enumeration DateJune 16, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1962407890 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers

Taxonomy Code174400000X

License✔ Licensed in OR · MD09256

Definition

An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.

19260 SW 65TH AVE, Tualatin, OR 97062

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Other Identifiers 1

Medicaid019729OR

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.

JAYMEE E DELANEY MD

Internal Medicine

19260 SW 65TH AVE, STE 270
TUALATIN, OR 97062

Washington County (503) 352-0770

JULIE A FIENE YEAGER MD

Pediatrics

19260 SW 65TH AVE, STE 340
TUALATIN, OR 97062

Washington County (503) 691-9777

MAGDALENNE MARIE CORSO MD

Pediatrics

19260 SW 65TH AVE, STE 275
TUALATIN, OR 97062

Washington County (503) 691-2519

MRS. DIANE DEBORAH HARPER FNP

Nurse Practitioner (Family)

19260 SW 65TH AVE, SUITE 435
TUALATIN, OR 97062

Washington County (503) 692-2032

DR. MICHAEL PAUL GARDNER M.D.

Urology

19260 SW 65TH AVE, SUITE 400
TUALATIN, OR 97062

Washington County (503) 692-1200

JEREMIAH C. MURPHY, M.D., PC

Specialist

19260 SW 65TH AVE, SUITE 400
TUALATIN, OR 97062

Washington County (503) 692-1200

INTERNAL MEDICINE NORTHWEST,LLC

Internal Medicine

19260 SW 65TH AVE, SUITE 270
TUALATIN, OR 97062

Washington County (503) 352-0770

JEREMIAH C MURPHY MD

Specialist

19260 SW 65TH AVE, SUITE 310
TUALATIN, OR 97062

Washington County (503) 692-1200

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 Donald Trelstad's NPI number?

The NPI number for Donald Trelstad is 1962407890. It was assigned to this individual provider in the NPPES registry on June 16, 2005.

Where is Donald Trelstad located?

Donald Trelstad practices at 19260 SW 65th Ave Ste 420, Tualatin, OR 97062. The listed phone number is (503) 692-0405.

What is Donald Trelstad's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

When was this NPI record last updated?

The NPPES record for Donald Trelstad was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 29 days 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.