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

Mark Harris, LCSW

Individual provider Clinical Social Worker · NPI 1083217061

Mark Harris, LCSW is a Clinical Social Worker in Matteson, Illinois. Qualified in 2016, 10 years ago. Practices with Loretto Hospital, a 38-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
10
Licensed in
IL
In the registry since
2020
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

21205 Sophia Dr
Matteson, IL 60443-1860
Phone: (708) 271-7363
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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 149026521 (IL)

Record details

NPI number1083217061
Entity typeIndividual (Type 1)
GenderMale
Credentials LCSW
Sole proprietorNo
NPI enumeratedNovember 20, 2020
Last updated in NPPESJuly 6, 2026
Certification dateJuly 6, 2026
Mailing address21205 Sophia Dr, Matteson, IL 60443-1860

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 2016 (10 years in practice)
Group practice Loretto Hospital — 38 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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