Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Amy J Williams, OD

Optometrist in Defiance, OH · enumerated 2005.

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

National Provider Identifier

1811979289

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Registry record

Entity type Individual (Type 1)

Name Dr. Amy J Williams

Credential OD

Sex Female

Practice address 1252 Ralston Ave Ste 400, Defiance, OH, 43512

Phone (419) 782-6588

Fax (419) 784-3622

Enumeration date Nov 18, 2005

Last updated in NPPES Nov 3, 2023

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 4600T1343 (OH) Secondary

152W00000X Optometrist Eye and Vision Services Providers · License OPT.004600 (OH) Primary

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

Other identifiers

Identifier	Type	State	Issuer
2577082	Medicaid	OH	-

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 1811979289 active?

Yes, as of the latest NPPES snapshot, NPI 1811979289 is active (record last updated 2023-11-03).

How do I verify Amy Williams's NPI record?

Cross-check NPI 1811979289 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-11-03.