Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Elizabeth Hope Sims-Day, ND

Naturopath in Woodinville, WA · enumerated 2017.

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

National Provider Identifier

1841709714

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Registry record

Entity type Individual (Type 1)

Name Dr. Elizabeth Hope Sims-Day

Credential ND

Sex Female

Practice address Woodinville, WA, 98072

Phone (425) 408-0040

Fax (425) 381-4833

Enumeration date Sep 23, 2017

Last updated in NPPES Mar 1, 2025

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

175F00000X Naturopath Other Service Providers · License 60807288 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Elizabeth Sims-Day?

The National Provider Identifier (NPI) for Elizabeth Sims-Day is 1841709714, a Type 1 (individual) record in the CMS NPPES registry.

Where does Elizabeth Sims-Day practice?

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

Other providers at this practice address

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Eleonora Naydis Naturopath · Woodinville, WA NPI 1114045549 Allison Apfelbaum Naturopath · Woodinville, WA NPI 1558774059

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-01.