Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marissa Williams

Social Worker in View Park, CA · enumerated 2023.

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

National Provider Identifier

1558040733

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Registry record

Entity type Individual (Type 1)

Name Marissa Williams

Sex Female

Practice address 4419 Angeles Vista Blvd, View Park, CA, 90043

Phone (310) 259-0493

Enumeration date Jul 14, 2023

Last updated in NPPES Jul 14, 2023

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers · License 119939 (NY) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1558040733 active?

Yes, as of the latest NPPES snapshot, NPI 1558040733 is active (record last updated 2023-07-14).

How do I verify Marissa Williams's NPI record?

Cross-check NPI 1558040733 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-07-14.