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

Katherine O'Sullivan, LCSW

Individual provider Clinical Social Worker · NPI 1619731908

Katherine O'Sullivan, LCSW is a Clinical Social Worker in Brewster, New York. Licensed in New York. Registered with an NPI since 2024.

Licensed in
NY
In the registry since
2024
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

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Practice location Address checks out

21 Marlin Rd
Brewster, NY 10509-1009
Phone: (646) 734-7891
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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 081032-1 (NY)

Record details

NPI number1619731908
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorNo
NPI enumeratedFebruary 7, 2024
Last updated in NPPESFebruary 7, 2024
Certification dateFebruary 7, 2024
Mailing address21 Marlin Rd, Brewster, NY 10509-1009

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