Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mayra Castillo

Specialist in San Francisco, CA · enumerated 2015.

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

National Provider Identifier

1942679857

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Registry record

Entity type Individual (Type 1)

Name Mayra Castillo

Sex Female

Practice address 1380 Howard St Fl 1, San Francisco, CA, 94103

Phone (415) 503-4730

Enumeration date Sep 21, 2015

Last updated in NPPES Sep 21, 2015

Taxonomy & licenses

174400000X Specialist Other 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

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 Mayra Castillo?

Mayra Castillo is registered in NPPES with the primary taxonomy of Specialist. 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 2015-09-21.