Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Hajar Abdallah Williams, RRT

Registered Respiratory Therapist in Oakland, CA · enumerated 2019.

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

National Provider Identifier

1457824476

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Registry record

Entity type Individual (Type 1)

Name Hajar Abdallah Williams

Credential RRT

Sex Female

Practice address 3600 Broadway, Oakland, CA, 94611

Phone (510) 752-6284

Enumeration date Jan 3, 2019

Last updated in NPPES Dec 30, 2021

Taxonomy & licenses

227900000X Registered Respiratory Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 25240 (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

What specialty is Hajar Williams?

Hajar Williams is registered in NPPES with the primary taxonomy of Registered Respiratory Therapist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-30.