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

Mr. Marcus Olszowy

Individual provider Social Worker · NPI 1356701239

Mr. Marcus Olszowy is a Social Worker in Salem, Massachusetts. Practices as a sole proprietor. Registered with an NPI since 2016.

In the registry since
2016

Practice location Address checks out

110 Boston St
Salem, MA 01970-1402
Phone: (978) 219-1569
Show map & directions

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

Specialties & licences

Social Worker (primary) Taxonomy 104100000X

Record details

NPI number1356701239
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorYes
NPI enumeratedMarch 4, 2016
Last updated in NPPESApril 15, 2016
Mailing address110 Boston St, Salem, MA 01970-1402

Other providers in Salem