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

Dr. Mark Sisti, PHD

Individual provider Psychologist · NPI 1801937800

Dr. Mark Sisti, PHD is a Psychologist in South Setauket, New York. Practices as a sole proprietor. Licensed in New York.

Licensed in
NY
In the registry since
2007
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

32 Arbor Ridge Ln
South Setauket, NY 11720-1405
Phone: (631) 696-2896
Fax: (631) 696-2896
Show map & directions

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

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence 011538 (NY)

Record details

NPI number1801937800
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedFebruary 11, 2007
Last updated in NPPESJuly 8, 2007

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