Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William A Portuese, M.D.

Otolaryngology Physician in Seattle, WA · enumerated 2005.

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

National Provider Identifier

1649268210

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Registry record

Entity type Individual (Type 1)

Name William A Portuese

Credential M.D.

Sex Male

Practice address 1101 Madison St, Suite 1280, Seattle, WA, 98104

Phone (206) 624-6200

Fax (206) 624-0244

Enumeration date Oct 7, 2005

Last updated in NPPES Jun 24, 2010

Taxonomy & licenses

207Y00000X Otolaryngology Physician Allopathic & Osteopathic Physicians · License MD00028539 (WA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
8128381	Medicaid	WA	-

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 is the NPI number for William Portuese?

The National Provider Identifier (NPI) for William Portuese is 1649268210, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Portuese practice?

The practice location on file with NPPES is in Seattle, WA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-06-24.