Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Marianna Zara Grennan, LCSWR

Individual provider Clinical Social Worker · NPI 1013188390

Marianna Zara Grennan, LCSWR is a Clinical Social Worker in Melville, New York. Practices as a sole proprietor. Licensed in New York.

Licensed in
NY
In the registry since
2008
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Practice location Address checks out

900 Walt Whitman Rd Ste 300
Melville, NY 11747 Not confirmed with CMS for 18 years — call before visiting
Phone: (631) 271-5617
Fax: (631) 385-1776
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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 R049385 (NY)

Record details

NPI number1013188390
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSWR
Sole proprietorYes
NPI enumeratedMarch 14, 2008
Last updated in NPPESMarch 14, 2008

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