Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Kathryn Gyo Hammer, ASW
Social Worker in Los Angeles, CA · enumerated 2023.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1043903388
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Registry record
Entity type Individual (Type 1)
Name Kathryn Gyo Hammer
Credential ASW
Sex Female
Practice address 442 S San Pedro St, Los Angeles, CA, 90013
Phone (213) 680-0600
Enumeration date Jun 1, 2023
Last updated in NPPES Jun 1, 2023
Taxonomy & licenses
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
How do I verify Kathryn Hammer's NPI record?
Cross-check NPI 1043903388 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1043903388 active?
Yes, as of the latest NPPES snapshot, NPI 1043903388 is active (record last updated 2023-06-01).
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-06-01.