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

Individual provider Clinical Social Worker · NPI 1619688603

Nathan William Flessner, LCSW is a Clinical Social Worker in Chicago, Illinois. Licensed in Illinois. Registered with an NPI since 2022.

Licensed in
IL
In the registry since
2022
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

2755 N Pine Grove Ave
Chicago, IL 60614-6109
Phone: (312) 259-2665
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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 149.025006 (IL)

Record details

NPI number1619688603
Entity typeIndividual (Type 1)
GenderMale
Credentials LCSW
Sole proprietorNo
NPI enumeratedDecember 9, 2022
Last updated in NPPESDecember 9, 2022
Certification dateDecember 9, 2022

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