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
Mailing addressPo Box 1114, Northampton, MA 01061-1114

Other providers in Northampton