Provider Profile
Sebastian Niezen
Unclaimed ProfileAbout Sebastian Niezen
Based in Boston, MA, Sebastian Niezen is listed in the NPI registry under gastroenterology. Sebastian is also listed as specializing in internal medicine.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Contact Information
- (617) 480-3735
- Email not available
Practice Locations
330 BROOKLINE AVE
Boston, MA 02215
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 5
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Common questions
What kind of doctor is Sebastian Niezen?
Sebastian Niezen is a gastroenterologist in Boston, MA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
What is Sebastian Niezen's address?
Sebastian Niezen is listed at 330 Brookline Ave, Boston, MA 02215. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Sebastian Niezen?
The number on file is (617) 480-3735. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Sebastian Niezen?
Sebastian Niezen's National Provider Identifier is 1265162291. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
How much experience does Sebastian Niezen have?
Sebastian Niezen has 4+ years experience. Registered with an NPI since 2022. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.
NPI registry
Is Sebastian Niezen's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Sebastian Niezen. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.