Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Philip L. Knowles, PHD
Psychologist in Edmonds, WA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1811052905
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Registry record
Entity type Individual (Type 1)
Name Philip L. Knowles
Credential PHD
Sex Male
Practice address 21616 76th Ave W, #102, Edmonds, WA, 98026
Phone (425) 774-1538
Fax (425) 744-1527
Enumeration date Dec 27, 2006
Last updated in NPPES Nov 4, 2011
Taxonomy & licenses
103T00000X Psychologist Behavioral Health & Social Service Providers · License PY00000874 (WA) Primary
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers.
About the PHD 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.
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 Philip Knowles?
Philip Knowles is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-11-04.