Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. William Joseph Lau III, PA-C

Physician Assistant in Tucson, AZ · enumerated 2013.

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

National Provider Identifier

1972844314

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Registry record

Entity type Individual (Type 1)

Name Mr. William Joseph Lau III

Credential PA-C

Sex Male

Practice address Southern Arizona Va Health Care System, 3601 S. 6th Ave., 7-11a, Tucson, AZ, 85723

Phone (520) 629-1814

Fax (520) 629-1779

Enumeration date Mar 11, 2013

Last updated in NPPES Mar 11, 2013

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 5374 (AZ) 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

What specialty is William Lau?

William Lau 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 2013-03-11.