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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MS. FLO MARSHAK LCSW
NPI 1265405641
Social Worker - Clinical in Smithtown, NY

Active since February 08, 2006
50 KARL AVE, STE 205, SMITHTOWN, NY 11787(631) 724-5500(631) 724-5500 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Ms. Flo Marshak Lcsw NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MS. FLO MARSHAK LCSW (NPI 1265405641) is an individual clinical provider in Smithtown, New York, licensed in New York (R0520641) and active in the NPI registry since February 2006.

NPPES Registry Identity

NPI1265405641
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameMS. FLO MARSHAKCredential: LCSW
Location Address50 KARL AVE, STE 205Smithtown, NY 11787
Mailing Address50 Karl Ave, Ste 205Smithtown, NY 11787 · (631) 724-5500 · Fax (631) 724-5500
Phone(631) 724-5500
Fax(631) 724-5500
Sole ProprietorNo
Enumeration DateFebruary 8, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1265405641 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in NY · R0520641
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
50 KARL AVE, Smithtown, NY 11787
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Other Names 1

Former Name (1)Ms. Flora Marshak

Other Identifiers 1

Medicaid01650128NY

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. SPIRO THEOHARAKIS MD
Psychiatry & Neurology (Psychiatry)
50 KARL AVE, STE 205
SMITHTOWN, NY 11787
Suffolk County (631) 366-3600
ADVANCED PSYCHOLOGICAL ASSESSMENT, P.C.
Clinical Neuropsychologist
50 KARL AVE, SUITE 104
SMITHTOWN, NY 11787
Suffolk County (631) 378-0741

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Flo Marshak's NPI number?

The NPI number for Flo Marshak is 1265405641. It was assigned to this individual provider in the NPPES registry on February 8, 2006. The provider is also known as Ms. Flora Marshak.

Where is Flo Marshak located?

Flo Marshak practices at 50 Karl Ave Ste 205, Smithtown, NY 11787. The listed phone number is (631) 724-5500.

What is Flo Marshak's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

When was this NPI record last updated?

The NPPES record for Flo Marshak was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 32 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.