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

Mr. William S. Piekarz, LCSW

Individual provider Clinical Social Worker · NPI 1699093153

Mr. William S. Piekarz, LCSW is a Clinical Social Worker in Oak Brook, Illinois. Qualified in 2005, 21 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
21
Licensed in
IL
In the registry since
2010
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

2625 Butterfield Rd Ste 103W
Oak Brook, IL 60523-3418
Phone: (630) 418-5316
Fax: (630) 586-3800
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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 149.014069 (IL)

Record details

NPI number1699093153
Entity typeIndividual (Type 1)
GenderMale
Credentials LCSW
Sole proprietorYes
NPI enumeratedMay 8, 2010
Last updated in NPPESApril 25, 2016

Medicare enrollment

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

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 2005 (21 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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