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

William Brydon Barr

Q: What is the NPI number for William Barr?

The National Provider Identifier (NPI) for William Barr is 1346673399, a Type 1 (individual) record in the CMS NPPES registry.

Addiction (Substance Use Disorder) Counselor in Lemon Grove, CA · enumerated 2013 · practices at Mcalister Institute for Treatment & Education, Inc..

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

National Provider Identifier

1346673399

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Registry record

Entity type Individual (Type 1)

Name William Brydon Barr

Sex Male

Practice address Lemon Grove, CA, 91945

Phone (619) 461-4871

Enumeration date Aug 13, 2013

Last updated in NPPES Aug 13, 2013

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

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers Primary

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

Where does William Barr practice?

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

What is the NPI number for William Barr?

The National Provider Identifier (NPI) for William Barr is 1346673399, 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 2013-08-13.