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

Dr. Alison Nathan, PHD

Clinical Psychologist in Fullerton, CA · enumerated 2006.

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

National Provider Identifier

1659478204

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Registry record

Entity type Individual (Type 1)

Name Dr. Alison Nathan

Credential PHD

Sex Female

Practice address Fullerton, CA, 92831

Phone (714) 871-9732

Fax (714) 871-4561

Enumeration date Sep 17, 2006

Last updated in NPPES Oct 21, 2011

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 PSY7777 (CA) 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 Alison Nathan?

The National Provider Identifier (NPI) for Alison Nathan is 1659478204, a Type 1 (individual) record in the CMS NPPES registry.

Where does Alison Nathan practice?

The practice location on file with NPPES is in Fullerton, CA. 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 2011-10-21.