NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

William B Davies, L.O.

Optician in Darien, CT · enumerated 2007.

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

National Provider Identifier

1023233285

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Registry record

Entity type Individual (Type 1)
Name William B Davies
Credential L.O.
Sex Male
Practice address Darien, CT, 06820
Phone (203) 655-9571
Fax (203) 655-0774
Enumeration date Apr 14, 2007
Last updated in NPPES Mar 3, 2009

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

156FX1800X Optician Eye and Vision Services Providers · License LO 720 (CT) Primary

Other identifiers

Identifier Type State Issuer
1215103320 Other CT SUPPLIER NPI

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.

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Frequently asked questions

Where does William Davies practice?
The practice location on file with NPPES is in Darien, CT. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for William Davies?
The National Provider Identifier (NPI) for William Davies is 1023233285, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-03-03.