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

Dr. Stephanie Berkman Holzner, PH.D.

Psychologist in Placentia, CA · enumerated 2007.

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

National Provider Identifier

1598880189

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Registry record

Entity type Individual (Type 1)

Name Dr. Stephanie Berkman Holzner

Credential PH.D.

Sex Female

Practice address Placentia, CA, 92870

Phone (562) 882-2141

Fax (714) 985-9244

Enumeration date Mar 20, 2007

Last updated in NPPES Jun 15, 2021

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 PSY11979 (CA) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY11979 (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

Where does Stephanie Holzner practice?

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

What is the NPI number for Stephanie Holzner?

The National Provider Identifier (NPI) for Stephanie Holzner is 1598880189, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-15.