Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ana Isabel Castillo, BA

Psychologist in Oakland, CA · enumerated 2023.

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

National Provider Identifier

1003597121

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Registry record

Entity type Individual (Type 1)

Name Ana Isabel Castillo

Credential BA

Sex Female

Practice address 3301 E 12th St Ste 259, Oakland, CA, 94601

Phone (510) 269-9030

Enumeration date Jul 31, 2023

Last updated in NPPES Jun 5, 2024

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

103T00000X Psychologist 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1003597121 active?

Yes, as of the latest NPPES snapshot, NPI 1003597121 is active (record last updated 2024-06-05).

How do I verify Ana Castillo's NPI record?

Cross-check NPI 1003597121 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-06-05.