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

Mark Horwitz, LICSW

Individual provider Clinical Social Worker · NPI 1003962580

Mark Horwitz, LICSW is a Clinical Social Worker in Northampton, Massachusetts. Practices as a sole proprietor. Licensed in Massachusetts.

Licensed in
MA
In the registry since
2007
What do these letters mean?
LICSW — Licensed Independent Clinical Social Worker
The title some states use for an independently practising clinical social worker.

See every abbreviation used in this directory →

Practice location Address checks out

31 Trumbull Rd
Northampton, MA 01060-3036
Phone: (413) 586-1823
Fax: (413) 586-1823
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 106629 (MA)

Record details

NPI number1003962580
Entity typeIndividual (Type 1)
GenderMale
Credentials LICSW
Sole proprietorYes
NPI enumeratedJanuary 26, 2007
Last updated in NPPESJuly 8, 2007

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