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

MS. Diana Marie O'Brien, LCSW

Individual provider Clinical Social Worker · NPI 1700035375

MS. Diana Marie O'Brien, LCSW is a Clinical Social Worker in Norwalk, Connecticut. Practices as a sole proprietor. Licensed in Connecticut.

Licensed in
CT
In the registry since
2008
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

161 E Ave Ste 204
Norwalk, CT 06851-5710
Phone: (203) 838-8344
Fax: (203) 523-5892
Show map & directions

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

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 004656 (CT)

Record details

NPI number1700035375
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorYes
NPI enumeratedSeptember 18, 2008
Last updated in NPPESSeptember 18, 2008

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