Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Woo, MD

Internal Medicine Physician in Seattle, WA · enumerated 2006.

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

National Provider Identifier

1851453799

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Registry record

Entity type Individual (Type 1)

Name William Woo

Credential MD

Sex Male

Practice address 2208 Nw Market St, Ste 410, Seattle, WA, 98107

Phone (206) 320-3335

Fax (206) 320-8027

Enumeration date Dec 15, 2006

Last updated in NPPES Aug 29, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD00021800 (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
0126986	Other	WA	LABOR AND INDUSTRIES
8147274	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

Is NPI 1851453799 active?

Yes, as of the latest NPPES snapshot, NPI 1851453799 is active (record last updated 2007-08-29).

How do I verify William Woo's NPI record?

Cross-check NPI 1851453799 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Joanne Beaubien Pediatrics Physician · Seattle, WA NPI 1538157599 Swedish Health Services Family Medicine Physician · Seattle, WA NPI 1922048818 Kristine Champagne Clinical Social Worker · Seattle, WA NPI 1932111341 Margaux Emanuel Family Medicine Physician · Seattle, WA NPI 1326155136 Janice Janofsky Clinical Social Worker · Seattle, WA NPI 1306946009 Amy Deans Internal Medicine Physician · Seattle, WA NPI 1568546281 Jay Innes Psychiatry Physician · Seattle, WA NPI 1811071533 Tom Eggert Mental Health Counselor · Seattle, WA NPI 1275692535

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-08-29.