OrganizationActive
John P. Katzenberg
NPI 1689716813 · Internal Medicine Physician · Groton, MA
John P. Katzenberg is a Internal Medicine Physician organization in Groton, MA (NPI 1689716813).
Provider details
- NPI number
- 1689716813
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- John Katzenberg, Owner Physician(978) 448-6855
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
292 Main St.
Groton, MA 01450
Phone: (978) 448-6855
Fax: (978) 448-2202
Street-level locationGet directions
Mailing address
292 Main St.
Groton, MA 01450
Registry dates
- Enumerated
- 2007-02-13
- Last updated
- 2020-08-22
Frequently asked questions
- What is John P. Katzenberg's NPI number?
- John P. Katzenberg's National Provider Identifier (NPI) is 1689716813, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is John P. Katzenberg?
- John P. Katzenberg is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John P. Katzenberg located?
- John P. Katzenberg's practice location on file with NPPES is 292 Main St., Groton, MA 01450.
- What is John P. Katzenberg's phone number?
- The practice phone number listed in the NPPES registry for John P. Katzenberg is (978) 448-6855.
- Who is the authorized official for John P. Katzenberg?
- The authorized official listed on John P. Katzenberg's NPPES record is John Katzenberg, Owner Physician. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is John P. Katzenberg's NPI active?
- Yes — John P. Katzenberg's NPI (1689716813) is active in the NPPES registry as of the last update on 2020-08-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.