Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Stewart Gordon Willoughby, DDS LDS RCS MS
Dentist in Chicago, IL · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1659424232
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Registry record
Entity type Individual (Type 1)
Name Dr. Stewart Gordon Willoughby
Credential DDS LDS RCS MS
Sex Male
Practice address 8301 S Brandon Ave, Chicago, IL, 60617
Phone (773) 375-6199
Enumeration date Jan 19, 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
How do I verify Stewart Willoughby's NPI record?
Cross-check NPI 1659424232 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1659424232 active?
Yes, as of the latest NPPES snapshot, NPI 1659424232 is active (record last updated 2007-07-08).
Other providers at this practice address
Browse all → Steve Kleronomos General Practice Dentistry · Chicago, IL NPI 1881768729 Stewart G Willoughby DDS PC Dentist · Chicago, IL NPI 1427122274 Stewart G. Willoughby DDS PC & M. Al-Asadi DDS PC Partnership General Practice Dentistry · Chicago, IL NPI 1932238284 A&W Dental Associates Dentist · Chicago, IL NPI 1629289913 Sjnomos General Practice Dentistry · Chicago, IL NPI 1447569439
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.