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

Mr. Mark William Hennessey, LCSW-R

Individual provider Clinical Social Worker · NPI 1427366772

Mr. Mark William Hennessey, LCSW-R is a Clinical Social Worker in Brewster, New York. Licensed in New York. Registered with an NPI since 2010.

Licensed in
NY
In the registry since
2010

Practice location Address checks out

400 Doansburg Rd
Brewster, NY 10509-5902
Phone: (845) 279-2995
Fax: (845) 279-2077
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 070709-1 (NY)

Record details

NPI number1427366772
Entity typeIndividual (Type 1)
GenderMale
Credentials LCSW-R
Sole proprietorNo
NPI enumeratedSeptember 21, 2010
Last updated in NPPESSeptember 21, 2010

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