Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Toan Nguyen, M.D.

Allergy & Immunology Physician in Redmond, WA · enumerated 2006.

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

National Provider Identifier

1861445017

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Registry record

Entity type Individual (Type 1)

Name Dr. William Toan Nguyen

Credential M.D.

Sex Male

Practice address 8301 161st Ave Ne Ste 308, Redmond, WA, 98052

Phone (206) 527-1200

Enumeration date May 18, 2006

Last updated in NPPES Mar 26, 2024

Taxonomy & licenses

207K00000X Allergy & Immunology Physician Allopathic & Osteopathic Physicians · License MD61174262 (WA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

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.

What specialty is William Nguyen?

William Nguyen is registered in NPPES with the primary taxonomy of Allergy & Immunology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-03-26.