John Duffy, D.C.
NPI 1942481627 · Chiropractor · Waltham, MA
Enrolled with Medicare as Practitioner - Chiropractic · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Duffy, D.C. is a Chiropractor provider in Waltham, MA (NPI 1942481627).
Provider details
- NPI number
- 1942481627
- Entity type
- Individual
- Primary specialty
- ChiropractorChiropractic Providers
- Credential
- D.C.
- Sex
- Male
- Sole proprietor
- No
- License
- 1644 (MA)
Specialties & taxonomies
Chiropractic Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 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
Mailing address
Registry dates
- Enumerated
- 2007-11-21
- Last updated
- 2023-07-25
- Certified
- 2023-07-25
Frequently asked questions
- What is John Duffy's NPI number?
- John Duffy's National Provider Identifier (NPI) is 1942481627, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Duffy's specialty?
- John Duffy is listed in the NPPES registry with a primary specialty of Chiropractor (Chiropractic Providers).
- Where is John Duffy located?
- John Duffy's practice location on file with NPPES is 136 Bacon St, Waltham, MA 02451-0797.
- What is John Duffy's phone number?
- The practice phone number listed in the NPPES registry for John Duffy is (781) 894-4270.
- Does John Duffy accept Medicare?
- John Duffy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Duffy's NPI active?
- Yes — John Duffy's NPI (1942481627) is active in the NPPES registry as of the last update on 2023-07-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.