Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Jacob Williams, D.D.S.

General Practice Dentistry in Chicago, IL · enumerated 2011.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1871890343

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Registry record

Entity type Individual (Type 1)

Name Dr. William Jacob Williams

Credential D.D.S.

Sex Male

Practice address 5401 S Wentworth Ave, Suite 200, Chicago, IL, 60609

Phone (773) 538-6191

Fax (773) 538-8683

Enumeration date Feb 18, 2011

Last updated in NPPES Feb 18, 2011

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 019018984 (IL) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1871890343 active?

Yes, as of the latest NPPES snapshot, NPI 1871890343 is active (record last updated 2011-02-18).

How do I verify William Williams's NPI record?

Cross-check NPI 1871890343 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-02-18.