JOSEPH SIEMIENCZUK MD
NPI 1619900230
Internal Medicine in Portland, OR

Q: What is Joseph Siemienczuk's NPI number?

The NPI number for Joseph Siemienczuk is 1619900230. It was assigned to this individual provider in the NPPES registry on July 8, 2006.

Q: What is Joseph Siemienczuk's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Active since July 08, 2006

5050 NE HOYT ST, SUITE 454, PORTLAND, OR 97213(503) 215-6405(503) 215-6429 Get Directions Write a Review

NPPES record last updated: June 13, 2008. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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About Joseph Siemienczuk Md NPPES

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

JOSEPH SIEMIENCZUK MD (NPI 1619900230) is an individual internal medicine provider in Portland, Oregon, licensed in Oregon (MD12852) and active in the NPI registry since July 2006.

NPPES Registry Identity

NPI1619900230

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameJOSEPH SIEMIENCZUKCredential: MD

Location Address5050 NE HOYT ST, SUITE 454Portland, OR 97213-2991

Mailing AddressPo Box 13994Portland, OR 97213-0994 · (503) 215-6494 · Fax (503) 215-6644

Phone(503) 215-6405

Fax(503) 215-6429

Sole ProprietorNo

Enumeration DateJuly 8, 2006

Last NPPES UpdateJune 13, 2008

✔ NPI 1619900230 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in OR · MD12852

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

5050 NE HOYT ST, Portland, OR 97213

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Other Identifiers 2

Other110242831OR · Rr Medicare

Medicare UPIND72923

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.

MS. MOLLY ANNE BREDENBERG PT

Physical Therapist

5050 NE HOYT ST
PORTLAND, OR 97213

Multnomah County (503) 215-0424

ALISON MITCHELL MD

Family Medicine

5050 NE HOYT ST, SUITE 240
PORTLAND, OR 97213

Multnomah County (503) 215-6480

JOHN EDWARD HEFFNER MD

Internal Medicine (Pulmonary Disease)

5050 NE HOYT ST, SUITE 540
PORTLAND, OR 97213

Multnomah County (503) 215-6600

DR. THERESA MARIE MORIKAWA PHARMD, BCACP

Pharmacist (Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist)

5050 NE HOYT ST
PORTLAND, OR 97213

Multnomah County (503) 215-6296

JAMES H IMATANI, JR. M.D., PC

Surgery (Surgical Oncology)

5050 NE HOYT ST, SUITE 610
PORTLAND, OR 97213

Multnomah County (503) 467-4761

DONALD ANDREW YOUNG III MD

Urology

5050 NE HOYT ST, SUITE 514
PORTLAND, OR 97213

Multnomah County (503) 488-2323

SPECIALTY SURGERY PC

Surgery

5050 NE HOYT ST, STE 511
PORTLAND, OR 97213

Multnomah County (503) 232-0942

GRETCHEN E VANDERBEEK MD

Internal Medicine

5050 NE HOYT ST, SUITE 540
PORTLAND, OR 97213

Multnomah County (503) 215-6600

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 Joseph Siemienczuk's NPI number?

The NPI number for Joseph Siemienczuk is 1619900230. It was assigned to this individual provider in the NPPES registry on July 8, 2006.

Where is Joseph Siemienczuk located?

Joseph Siemienczuk practices at 5050 NE Hoyt St Suite 454, Portland, OR 97213. The listed phone number is (503) 215-6405.

What is Joseph Siemienczuk's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for Joseph Siemienczuk was last updated on June 13, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.