Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William C Colwell, DDS PS

Dentist in Seattle, WA · enumerated 2006.

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

National Provider Identifier

1003929183

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Registry record

Entity type Individual (Type 1)

Name Dr. William C Colwell

Credential DDS PS

Sex Male

Practice address 11066 5th Ave Ne, Ste #106, Seattle, WA, 98125

Phone (206) 365-6860

Fax (206) 365-0832

Enumeration date Aug 16, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

122300000X Dentist Dental Providers · License 3673 (WA) 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.

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Frequently asked questions

Where does William Colwell practice?

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

What is the NPI number for William Colwell?

The National Provider Identifier (NPI) for William Colwell is 1003929183, a Type 1 (individual) record in the CMS NPPES registry.

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