Flo Marshak, LCSW
Clinical Social Worker · Smithtown, NY
Flo Marshak, LCSW is a clinical social worker with a practice address in Smithtown, New York, and NPI 1265405641, issued on Feb 8, 2006. Check the license (New York R0520641, as entered in NPPES) with the New York board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Flo Marshak
- Credential
- LCSW
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- License number
- R0520641 NY
Self-reported in NPPES; status is on the state search - Practice location
- 50 Karl Ave, Smithtown, NY 11787
- Phone
- (631) 724-5500
- Enumerated
- Feb 8, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (631) 724-5500
- Medicaid ID
- 01650128 NY
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 29,293 in New York → Look up another NPI →
Also registered at 50 Karl Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Spiro Theoharakis, MDPsychiatry Physician1124004056
Verify Flo Marshak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New York board licenses this profession
Search for license R0520641Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Flo Marshak among 29,293 clinical social worker records in New York
Flo Marshak, LCSW is one of 29,293 clinical social worker records with a practice address in New York. 8% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 1% of them.
- NPI issued2006 · 1% of these records are older, 83% newer
- In a Medicare fileNo · 8% of these records are
- In the CMS Doctors and Clinicians fileNo · 17% of these records are
- Record last updated2026 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
170 clinical social worker records list a practice address in Smithtown
They are 170 of the 1,907 NPPES records with a practice address in Smithtown, and 29,293 clinical social worker records in New York. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 29,293 in New York → Every provider in Smithtown → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- Richard Bennett, L.C.S.W.Smithtown, NY 117871023024288
- Joan Didonato, LCSWSmithtown, NY 117871093780892
- Suzanne Dilullo, LCSWSmithtown, NY 117871184669657
- Diane Freedman, RLCSWSmithtown, NY 117871083632111
- Matthew Gee, LCSW PHDSmithtown, NY 117871710971692
- Valerie Jessen, L.C.S.WSmithtown, NY 117871740242585
- Barbara King, C.S.W.Smithtown, NY 117871093736654
- Dorothy Nollman, MSWSmithtown, NY 117871508810896
Common questions
What is Flo Marshak, LCSW's NPI number?
Flo Marshak, LCSW's National Provider Identifier (NPI) is 1265405641, issued on Feb 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Flo Marshak, LCSW located?
The NPPES record lists a practice address at 50 Karl Ave, Smithtown, NY, 11787. Phone: (631) 724-5500. Providers update this record themselves, so call before visiting.
How can I verify Flo Marshak, LCSW's license?
NPPES lists New York license number R0520641, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.