Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark Anthony Lopez, MSW
Social Worker in Altadena, CA · enumerated 2010.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1538469937
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Registry record
Entity type Individual (Type 1)
Name Mark Anthony Lopez
Credential MSW
Sex Male
Practice address 2933 El Nido Dr, Altadena, CA, 91001
Phone (626) 395-7100
Enumeration date Nov 1, 2010
Last updated in NPPES Jun 9, 2014
Taxonomy & licenses
104100000X Social Worker Behavioral Health & Social Service Providers · License ASW28964 (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.
Frequently asked questions
Is NPI 1538469937 active?
Yes, as of the latest NPPES snapshot, NPI 1538469937 is active (record last updated 2014-06-09).
How do I verify Mark Lopez's NPI record?
Cross-check NPI 1538469937 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 2014-06-09.