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

Mark Jacob Longsjo, LICSW

Individual provider Clinical Social Worker · NPI 1013949809

Mark Jacob Longsjo, LICSW is a Clinical Social Worker in Brockton, Massachusetts. Practices as a sole proprietor. Licensed in Massachusetts.

Licensed in
MA
In the registry since
2006
What do these letters mean?
LICSW — Licensed Independent Clinical Social Worker
The title some states use for an independently practising clinical social worker.

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Practice location Partly verified

Some contact details are missing from the federal record.

McLean Hospital Southeast Location 940 Belmont St
Brockton, MA 02301 Not confirmed with CMS for 19 years — call before visiting
Phone: (508) 894-8320
Fax: (508) 894-8334
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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 1026908 (MA)

Record details

NPI number1013949809
Entity typeIndividual (Type 1)
GenderMale
Credentials LICSW
Sole proprietorYes
NPI enumeratedJuly 6, 2006
Last updated in NPPESJuly 8, 2007

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