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

Marcelino Guzman

Addiction (Substance Use Disorder) Counselor in Downey, CA · enumerated 2016 · practices at Southern California Alcohol and Drug Programs, Inc..

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

National Provider Identifier

1538528583

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Registry record

Entity type Individual (Type 1)
Name Marcelino Guzman
Sex Male
Practice address Downey, CA, 90241
Phone (562) 923-7894
Fax (562) 869-3400
Enumeration date Feb 18, 2016
Last updated in NPPES Feb 18, 2016

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

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License C2741214 (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

Is NPI 1538528583 active?
Yes, as of the latest NPPES snapshot, NPI 1538528583 is active (record last updated 2016-02-18).
How do I verify Marcelino Guzman's NPI record?
Cross-check NPI 1538528583 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 2016-02-18.