Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Amy Catherine Hammerschlag, M.A.

Clinical Psychologist in Brea, CA · enumerated 2023.

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

National Provider Identifier

1407542905

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Registry record

Entity type Individual (Type 1)

Name Mrs. Amy Catherine Hammerschlag

Credential M.A.

Sex Female

Practice address 265 S Randolph Ave Ste 250, Brea, CA, 92821

Phone (657) 549-0857

Enumeration date Apr 17, 2023

Last updated in NPPES Apr 17, 2023

Taxonomy & licenses

103TS0200X School Psychologist Behavioral Health & Social Service Providers Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License PSB94027480 (CA) 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.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Amy Hammerschlag?

Amy Hammerschlag is registered in NPPES with the primary taxonomy of Clinical Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-04-17.