Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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MS. Mary O'Brien, LCSW, CASAC

Individual provider Addiction (Substance Use Disorder) Counselor · NPI 1962848820

MS. Mary O'Brien, LCSW, CASAC is an Addiction (Substance Use Disorder) Counselor in New York, New York. Licensed in New York. Registered with an NPI since 2013.

Licensed in
NY
In the registry since
2013
Specialties on file
3
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

1901 1st Ave
New York, NY 10029-7494
Phone: (212) 423-8255
Fax: (212) 423-6534
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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 085736 (NY)
Addiction (Substance Use Disorder) Counselor Taxonomy 101YA0400X · Licence 30264 (NY)
School Social Worker Taxonomy 1041S0200X · Licence 2916237 (NY)

Record details

NPI number1962848820
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW , CASAC
Sole proprietorNo
NPI enumeratedMay 20, 2013
Last updated in NPPESAugust 26, 2020
Certification dateAugust 26, 2020

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