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

Mark Williams

Individual provider Addiction (Substance Use Disorder) Counselor · NPI 1215522602

Mark Williams is an Addiction (Substance Use Disorder) Counselor in Chicago, Illinois. Licensed in Illinois. Registered with an NPI since 2021.

Licensed in
IL
In the registry since
2021

Practice location Address checks out

200 W Monroe St Ste 1150
Chicago, IL 60606-5036
Phone: (314) 369-8849
Show map & directions

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

Specialties & licences

Addiction (Substance Use Disorder) Counselor (primary) Taxonomy 101YA0400X · Licence 26701 (IL)

Record details

NPI number1215522602
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedMarch 8, 2021
Last updated in NPPESMarch 8, 2021
Certification dateFebruary 16, 2021

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