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

John W Mazellan, LCSW

Individual provider Clinical Social Worker · NPI 1851577472

John W Mazellan, LCSW is a Clinical Social Worker in Hillsborough, New Jersey. Practices as a sole proprietor. Licensed in New Jersey.

Licensed in
NJ
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

390 Amwell Rd Bldg 4 / Ste 401
Hillsborough, NJ 08844-1225
Phone: (908) 431-9200
Fax: (908) 431-9205
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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 44SC00606600 (NJ)

Record details

NPI number1851577472
Entity typeIndividual (Type 1)
GenderMale
Credentials LCSW
Sole proprietorYes
NPI enumeratedJanuary 14, 2008
Last updated in NPPESJanuary 14, 2008

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