Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Leslie Fierro

Addiction (Substance Use Disorder) Counselor in San Diego, CA · enumerated 2024 · practices at The Twelfth Step House of San Diego, Inc..

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

National Provider Identifier

1659193126

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Registry record

Entity type Individual (Type 1)

Name Leslie Fierro

Sex Female

Practice address 5855 Streamview Dr, San Diego, CA, 92105

Phone (619) 287-5460

Enumeration date Oct 28, 2024

Last updated in NPPES Jun 17, 2026

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 23394 (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

What is the NPI number for Leslie Fierro?

The National Provider Identifier (NPI) for Leslie Fierro is 1659193126, a Type 1 (individual) record in the CMS NPPES registry.

Where does Leslie Fierro practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-17.