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

Individual provider Psychologist · NPI 1255632337

Dr. Marc Joshua Diener, PHD is a Psychologist in Hewlett, New York. Practices as a sole proprietor. Licensed in New York and Virginia.

Licensed in
NY, VA
In the registry since
2010
Specialties on file
2
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

1800 Rockaway Ave Ste 206A
Hewlett, NY 11557-1665
Phone: (646) 246-1662
Fax: (646) 871-0203
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence 68017465 (NY)
Clinical Psychologist Taxonomy 103TC0700X · Licence 0810003955 (VA)

Record details

NPI number1255632337
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedNovember 5, 2010
Last updated in NPPESJuly 10, 2013

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