Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark Piechowiak, MSW
Social Worker in Yorkville, IL · enumerated 2013.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1366874380
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Registry record
Entity type Individual (Type 1)
Name Mark Piechowiak
Credential MSW
Sex Male
Practice address 121 Saravanos Rd, Yorkville, IL, 60560
Phone (630) 221-7432
Fax (630) 882-8409
Enumeration date Aug 1, 2013
Last updated in NPPES May 4, 2026
Taxonomy & licenses
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.
Frequently asked questions
What specialty is Mark Piechowiak?
Mark Piechowiak is registered in NPPES with the primary taxonomy of Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-04.