Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor
Mr. John R. Mazurek, MSW
Clinical Social Worker in Arlington Heights, IL · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1194717553
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Registry record
Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 462293000 | Other | IL | MAGELLAN MIS |
| 65820942 | Other | IL | UNITED BEHAVIORAL HEALTH |
| 01627745 | Other | IL | BC B S OF IL |
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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Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-06-23.