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

Mrs. Barbara Giannelli-O'Brien, LCSW

Individual provider Mental Health Counselor · NPI 1144239484

Mrs. Barbara Giannelli-O'Brien, LCSW is a Clinical Social Worker in South Setauket, New York. Graduated from State University of New York at Stony Brook, School of Medicine in 1989, 37 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in New York.

Years since qualifying
37
Trained at
State University of New York at Stony Brook, School of Medicine
Licensed in
NY
In the registry since
2006
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

See every abbreviation used in this directory →

Practice location Address checks out

3771 Nesconset Hwy Ste 208A
South Setauket, NY 11720-1154
Phone: (631) 751-9600
Show map & directions

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

Specialties & licences

Mental Health Counselor (primary) Taxonomy 101YM0800X · Licence R040503-1 (NY)

Record details

NPI number1144239484
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorYes
NPI enumeratedAugust 5, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolSTATE UNIVERSITY OF NEW YORK AT STONY BROOK, SCHOOL OF MEDICINE
Graduated 1989 (37 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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