Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gerardo Arellano Jr.

Behavior Analyst in Lancaster, CA · enumerated 2024.

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

National Provider Identifier

1205652674

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Registry record

Entity type Individual (Type 1)

Name Gerardo Arellano Jr.

Sex Male

Practice address 44460 20th St W, Lancaster, CA, 93534

Phone (714) 834-1111

Enumeration date Dec 2, 2024

Last updated in NPPES Dec 2, 2024

Taxonomy & licenses

103K00000X Behavior Analyst 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.

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Frequently asked questions

What specialty is Gerardo Arellano?

Gerardo Arellano is registered in NPPES with the primary taxonomy of Behavior Analyst. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-12-02.