Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Giles Spencer Marsden

Addiction (Substance Use Disorder) Counselor in Los Angeles, CA · enumerated 2025 · practices at Van Ness Recovery House Inc..

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

National Provider Identifier

1336016864

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Registry record

Entity type Individual (Type 1)

Name Giles Spencer Marsden

Sex Male

Practice address 1919 N Beachwood Dr, Los Angeles, CA, 90068

Phone (323) 463-4266

Fax (323) 962-6659

Enumeration date Oct 20, 2025

Last updated in NPPES Oct 20, 2025

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor 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 is the NPI number for Giles Marsden?

The National Provider Identifier (NPI) for Giles Marsden is 1336016864, a Type 1 (individual) record in the CMS NPPES registry.

Where does Giles Marsden practice?

The practice location on file with NPPES is in Los Angeles, 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 2025-10-20.