Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Thomas Mahoney, P.A.

Physician Assistant in Whittier, CA · enumerated 2006.

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

National Provider Identifier

1851331854

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Registry record

Entity type Individual (Type 1)

Name William Thomas Mahoney

Credential P.A.

Sex Male

Practice address 15725 Whittier Blvd, Suite 350, Whittier, CA, 90603

Phone (562) 947-0059

Enumeration date Jun 7, 2006

Last updated in NPPES Apr 29, 2011

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA11927 (CA) Primary

PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA credential

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

What specialty is William Mahoney?

William Mahoney is registered in NPPES with the primary taxonomy of Physician Assistant. 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 2011-04-29.