Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Kathryn Riordan, DPT
Physical Therapist in Ferndale, WA · enumerated 2023.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1659057537
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Registry record
Entity type Individual (Type 1)
Name Kathryn Riordan
Credential DPT
Sex Female
Practice address 1887 Main St #105, Ferndale, WA, 98248
Phone (360) 384-5111
Enumeration date Jun 26, 2023
Last updated in NPPES Jun 26, 2023
Taxonomy & licenses
225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 61446640 (WA) Secondary
225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 61446641 (WA) Primary
DPT · Doctor of Physical Therapy: A physical therapist holding the clinical doctorate now standard for the profession.
About the DPT 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
Where does Kathryn Riordan practice?
The practice location on file with NPPES is in Ferndale, WA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Kathryn Riordan?
The National Provider Identifier (NPI) for Kathryn Riordan is 1659057537, a Type 1 (individual) record in the CMS NPPES registry.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-06-26.