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

Sydney Mastorides, LMSW

Individual provider Social Worker · NPI 1700694411

Sydney Mastorides, LMSW is a Social Worker in West Islip, New York. Licensed in New York. Registered with an NPI since 2024.

Licensed in
NY
In the registry since
2024
Specialties on file
2
What do these letters mean?
LMSW — Licensed Master Social Worker
A master's-level social worker, usually practising under supervision.

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Practice location Address checks out

467A Higbie Ln
West Islip, NY 11795-2240
Phone: (516) 512-2409
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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 099273 (NY)
Social Worker Taxonomy 104100000X · Licence 113433 (NY)

Record details

NPI number1700694411
Entity typeIndividual (Type 1)
GenderFemale
Credentials LMSW
Sole proprietorNo
NPI enumeratedDecember 27, 2024
Last updated in NPPESJuly 14, 2025
Certification dateJuly 14, 2025

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