John Duffin, PHD
NPI 1932184868 · Psychologist · Watertown, WI
Enrolled with Medicare as Order and Referring Only - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Duffin, PHD is a Psychologist provider in Watertown, WI (NPI 1932184868).
Provider details
- NPI number
- 1932184868
- Entity type
- Individual
- Primary specialty
- PsychologistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Male
- License
- 871057 (WI)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
- 2005-12-14
- Last updated
- 2007-07-08
Frequently asked questions
- What is John Duffin's NPI number?
- John Duffin's National Provider Identifier (NPI) is 1932184868, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Duffin's specialty?
- John Duffin is listed in the NPPES registry with a primary specialty of Psychologist (Behavioral Health & Social Service Providers).
- Where is John Duffin located?
- John Duffin's practice location on file with NPPES is 129 Hospital Dr, Watertown, WI 53098-3384.
- What is John Duffin's phone number?
- The practice phone number listed in the NPPES registry for John Duffin is (920) 262-4800.
- Does John Duffin accept Medicare?
- John Duffin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Duffin's NPI active?
- Yes — John Duffin's NPI (1932184868) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.