Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mark Farrell O'Brien, MS, LCPC

Individual provider Professional Counselor · NPI 1932427986

Mark Farrell O'Brien, MS, LCPC is a Professional Counselor in Chicago, Illinois. Practices as a sole proprietor. Licensed in Illinois.

Licensed in
IL
In the registry since
2010
What do these letters mean?
MS — Master of Science
A graduate science degree.
LCPC — Licensed Clinical Professional Counselor
A licensed clinical counsellor.

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Practice location Partly verified

Some contact details are missing from the federal record.

605 N Michigan Ave Fl 4
Chicago, IL 60611-3141
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Professional Counselor (primary) Taxonomy 101YP2500X · Licence 180008079 (IL)

Record details

NPI number1932427986
Entity typeIndividual (Type 1)
GenderMale
Credentials MS , LCPC
Sole proprietorYes
NPI enumeratedMay 13, 2010
Last updated in NPPESSeptember 20, 2019

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