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

Dr. William Breen, PHD

Clinical Psychologist in Slingerlands, NY · enumerated 2011.

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

National Provider Identifier

1407144918

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Registry record

Entity type Individual (Type 1)

Name Dr. William Breen

Credential PHD

Sex Male

Practice address Slingerlands, NY, 12159

Phone (518) 764-4141

Fax (518) 439-1625

Enumeration date Jul 18, 2011

Last updated in NPPES Mar 16, 2015

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

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 019169 (NY) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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 William Breen?

The National Provider Identifier (NPI) for William Breen is 1407144918, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Breen practice?

The practice location on file with NPPES is in Slingerlands, NY. 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 2015-03-16.