Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Katherine A. C. Day
Naturopath in Mill Creek, WA · enumerated 2017.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1023555216
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Registry record
Entity type Individual (Type 1)
Name Katherine A. C. Day
Sex Female
Practice address 16030 Bothell Everett Hwy, Suite 220, Mill Creek, WA, 98012
Phone (425) 286-8803
Fax (866) 394-3445
Enumeration date Jan 25, 2017
Last updated in NPPES Jan 25, 2017
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 Katherine Day?
The National Provider Identifier (NPI) for Katherine Day is 1023555216, a Type 1 (individual) record in the CMS NPPES registry.
Where does Katherine Day practice?
The practice location on file with NPPES is in Mill Creek, WA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Janine Simon Physical Therapist · Mill Creek, WA NPI 1144228313 Cascade Children'S Therapy Speech-Language Pathologist · Mill Creek, WA NPI 1740225564 Bill Mulliken Durable Medical Equipment & Medical Supplies · Mill Creek, WA NPI 1053330308 Leland Shenfield Pediatric Dentistry · Mill Creek, WA NPI 1558476770 Thomas Saunders Clinical Social Worker · Mill Creek, WA NPI 1588766927 Thomas Kane General Practice Dentistry · Mill Creek, WA NPI 1932293040 Janine Czerniecki Pediatric Occupational Therapist · Millcreek, WA NPI 1033273115 J. L. Donaldson Services Corporation Specialist · Mill Creek, WA NPI 1558426395
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-01-25.