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

Individual provider Clinical Psychologist · NPI 1841577004

Dr. Mark S. Closson, PHD is a Clinical Psychologist in Garden City, New York. Qualified in 2010, 16 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in New York.

Years since qualifying
16
Licensed in
NY
In the registry since
2011
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

601 Franklin Ave Ste 200
Garden City, NY 11530-5760
Phone: (516) 669-0135
Fax: (631) 754-1642
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 019356 (NY)

Record details

NPI number1841577004
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedNovember 15, 2011
Last updated in NPPESNovember 15, 2011

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 2010 (16 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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