Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. John J. Skowron Jr.
Dentist in Winnetka, IL · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1407991581
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Registry record
Entity type Individual (Type 1)
Name Dr. John J. Skowron Jr.
Sex Male
Practice address 575 Lincoln Ave, Winnetka, IL, 60093
Phone (847) 446-0970
Fax (847) 446-0979
Enumeration date Feb 20, 2007
Last updated in NPPES Jul 8, 2007
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
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.
What specialty is John Skowron Jr.?
John Skowron Jr. is registered in NPPES with the primary taxonomy of Dentist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Michael Gaynor Endodontics · Winnetka, IL NPI 1073527834 John Stone General Practice Dentistry · Winnetka, IL NPI 1366573776 John H. Stone, D.D.S. and John J. Skoworon Jr., D.D.S.,Ltd. Dentist · Winnetka, IL NPI 1063636843 Zachary Ryan Chiropractor · Winnetka, IL NPI 1326478363 Ayzenshteyn Chiropractic S.C Chiropractor · Winnetka, IL NPI 1801347521 Karl Olof Rikard Boerjesson Chiropractor · Winnetka, IL NPI 1598264749 Chiropractic Without Limits LLC Chiropractor · Winnetka, IL NPI 1922502731
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.