Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum
Dr. Joshua A. Williams, LLC
Psychiatry Physician in Northbrook, IL · enumerated 2016 · authorized official Joshua Williams, Owner / President.
Data current as of Jul 11, 2026 · sourced from CMS NPPES
National Provider Identifier
1649620188
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Taxonomy & classification
Authorized official
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty.
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Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2016-06-15.