Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Benjamin Siemanowski, MD

Individual provider Gastroenterology Physician · NPI 1548301120

Benjamin Siemanowski, MD practises Gastroenterology in Bellingham, Washington. Graduated from Jefferson Medical College of Thomas Jefferson University in 2000, 26 years ago. Practices with Northwest Gastroenterology Professional LLC, a 13-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Washington.

Years since qualifying
26
Trained at
Jefferson Medical College of Thomas Jefferson University
Licensed in
WA
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3111 Woburn St Ste 201
Bellingham, WA 98226-6610
Phone: (360) 734-1420
Fax: (360) 733-1659
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence MD00047499 (WA)

Record details

NPI number1548301120
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 8, 2007
Last updated in NPPESMay 24, 2023
Certification dateMay 24, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGASTROENTEROLOGY
Also practisesINTERNAL MEDICINE
Medical schoolJEFFERSON MEDICAL COLLEGE OF THOMAS JEFFERSON UNIVERSITY
Graduated 2000 (26 years in practice)
Group practice Northwest Gastroenterology Professional Llc — 13 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 112 times · 82nd percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 100 times · 77th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients399
Services billed 10,641 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Island Hospital Hospital · Anacortes, WA
  • Peacehealth St Joseph Medical Center Hospital · Bellingham, WA

Colleagues at Northwest Gastroenterology Professional LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Bellingham