Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
William Sontag
Specialist in Bremerton, WA · enumerated 2015.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1366839060
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Registry record
Entity type Individual (Type 1)
Name William Sontag
Sex Male
Practice address 1007 Scott Ave, Suite B, Bremerton, WA, 98310
Phone (360) 405-0293
Fax (360) 373-2461
Enumeration date Apr 20, 2015
Last updated in NPPES Apr 20, 2015
Taxonomy & licenses
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.
Frequently asked questions
What is the NPI number for William Sontag?
The National Provider Identifier (NPI) for William Sontag is 1366839060, a Type 1 (individual) record in the CMS NPPES registry.
Where does William Sontag practice?
The practice location on file with NPPES is in Bremerton, 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 2015-04-20.