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

Dr. John T Duffin, PHD

Individual provider Psychologist · NPI 1932184868

Dr. John T Duffin, PHD is a Psychologist in Watertown, Wisconsin. Licensed in Wisconsin. Registered with an NPI since 2005.

Licensed in
WI
In the registry since
2005
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

129 Hospital Dr
Watertown, WI 53098-3384
Phone: (920) 262-4800
Fax: (920) 262-4813
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence 871057 (WI)

Record details

NPI number1932184868
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedDecember 14, 2005
Last updated in NPPESJuly 13, 2026
Mailing address129 Hospital Dr, Watertown, WI 53098-3384

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