Benjamin SiemanowskiM.D.
Gastroenterology·Bellingham, WA
Benjamin Siemanowski, M.D. is a Gastroenterology provider in Bellingham, WA affiliated with 1 ambulatory surgery center in WA, as of July 2026.
- NPI1548301120
- Registered2007
- Centers1
- StateWA
- Class of2000
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Ambulatory surgery centers
Centers whose service lines match this provider’s. Affiliations change; verify independently.
Education
Education on record as of August 2026.
Benjamin Siemanowski at a glance
- Provider
- Benjamin Siemanowski
- Credential
- M.D.
- Specialty
- Gastroenterology
- Procedures
- Gastroenterology CPT codes
- Location
- Bellingham, WA
- Medical school
- Jefferson Medical College of Thomas Jefferson University
- Graduated
- 2000
- NPI registered
- 2007
- NPI
- 1548301120
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does Benjamin Siemanowski practice?
Benjamin Siemanowski, M.D. is based in Bellingham, WA and is affiliated with 1 ambulatory surgery center: Northwest Endoscopy Center LLC in Bellingham, WA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is Benjamin Siemanowski's NPI number?
Benjamin Siemanowski's National Provider Identifier (NPI) is 1548301120, registered in 2007. Specialty on record: Gastroenterology; credential M.D.
Where did Benjamin Siemanowski go to medical school?
Benjamin Siemanowski, M.D. attended Jefferson Medical College of Thomas Jefferson University, graduating in 2000.
How many Gastroenterology providers in Washington work at ambulatory surgery centers?
120 Gastroenterology surgeons and proceduralists in Washington are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, Benjamin Siemanowski among them. The Washington Gastroenterology directory lists each one by city with credential, NPI, and center affiliations.
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