Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

John P. Katzenberg

Organization Internal Medicine Physician · NPI 1689716813

John P. Katzenberg is an Internal Medicine Physician in Groton, Massachusetts. Registered with an NPI since 2007.

In the registry since
2007

Practice location Address checks out

292 Main St
Groton, MA 01450
Phone: (978) 448-6855
Fax: (978) 448-2202
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X

Record details

NPI number1689716813
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official John Katzenberg — Owner Physician · (978) 448-6855
NPI enumeratedFebruary 13, 2007
Last updated in NPPESAugust 22, 2020
Mailing address292 Main St., Groton, MA 01450

Other providers in Groton