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

Mrs. Sara G Castro

Q: What is the NPI number for Sara Castro?

The National Provider Identifier (NPI) for Sara Castro is 1093943573, a Type 1 (individual) record in the CMS NPPES registry.

Social Worker in Brentwood, CA · enumerated 2009.

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

National Provider Identifier

1093943573

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Registry record

Entity type Individual (Type 1)

Name Mrs. Sara G Castro

Sex Female

Practice address Brentwood, CA, 94513

Phone (925) 634-4445

Fax (925) 634-6235

Enumeration date Jun 23, 2009

Last updated in NPPES Jun 23, 2009

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers Primary

Other identifiers

Identifier	Type	State	Issuer
942751073	Other	CA	FAMILLIAS UNIDAS

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 Sara Castro practice?

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

What is the NPI number for Sara Castro?

The National Provider Identifier (NPI) for Sara Castro is 1093943573, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-06-23.