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

Johnathan Duff, PHD

Individual provider Psychologist · NPI 1548734460

Johnathan Duff, PHD is a Psychologist in Falls Church, Virginia. Practices as a sole proprietor. Licensed in Virginia.

Licensed in
VA
In the registry since
2019
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

See every abbreviation used in this directory →

Practice location Address checks out

5691 Columbia Pike Ste 200
Falls Church, VA 22041-2888
Phone: (703) 998-5606
Show map & directions

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

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence 0810005803 (VA)

Record details

NPI number1548734460
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedJanuary 14, 2019
Last updated in NPPESJune 11, 2019
Mailing address5691 Columbia Pike Ste 200, Falls Church, VA 22041-2888

Other providers in Falls Church