Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Derek Williams, OD

Optometrist in Saginaw, MI · enumerated 2018.

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

National Provider Identifier

1942793294

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Registry record

Entity type Individual (Type 1)

Name Dr. Derek Williams

Credential OD

Sex Male

Practice address 1522 Janes Ave, Saginaw, MI, 48601

Phone (989) 907-2790

Fax (989) 399-8263

Enumeration date Jun 12, 2018

Last updated in NPPES Apr 12, 2021

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 4901005110 (MI) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD 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

What is the NPI number for Derek Williams?

The National Provider Identifier (NPI) for Derek Williams is 1942793294, a Type 1 (individual) record in the CMS NPPES registry.

Where does Derek Williams practice?

The practice location on file with NPPES is in Saginaw, MI. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-04-12.