Registry data as of Aug 27, 2026

Katherine Mattax, ND

Naturopath · Seattle, WA

Katherine Mattax, ND is a naturopath with a practice address in Seattle, Washington, and NPI 1053023846, issued on Dec 23, 2022. Check the license with the Washington board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, loaded Aug 27, 2026 · method · Verify with CMS →

NPPES recordas of Aug 27, 2026
1053023846
Name
Katherine Mattax
Credential
ND
Primary taxonomy
Naturopath 175F00000X
Practice location
5470 Shilshole Ave NW Ste 500, Seattle, WA 98107
Phone
(206) 279-6390
Enumerated
Dec 23, 2022
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 5470 Shilshole Ave NW Ste 500

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Alison HearstNaturopath1598375081
  2. Helen Kinsel, NDNaturopath1275048027
  3. Kailina MastroianniAcupuncturist1790254092
  4. Brynn Olinger, NDNaturopath1255158226
  5. Michael Rak, N.D.Naturopath1649729856
  6. Shereen Spriggs, NDNaturopath1972277515

Verify Katherine Mattax in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Washington board licenses this professionCheck the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
Find the Washington license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

473 naturopath records list a Seattle practice address

They are 473 of the 41,956 NPPES records with a Seattle practice address, and 1,373 naturopath records in Washington. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 473 in Seattle → All 1,373 in Washington → Every provider in Seattle →

Other naturopath records in Washington

  1. Candace Aasan, N.D.Kirkland, WA1265598353
  2. Hilliary Abbott, NDLynnwood, WA1477331387
  3. Rhea Abbott, NDRedmond, WA1245652346
  4. Zakiyyah Abdul-Azeem, NDEverett, WA1063261816
  5. Marianna Abrams, N.D.Seattle, WA1497987754
  6. Kristen Acesta, NDCashmere, WA1255769253
  7. Sarah Acosta Smith, NDBrewster, WA1437298502
  8. Laura Adair, NDKirkland, WA1669194478
  9. Suzanne Adams, N.D.Olympia, WA1700944683
  10. Courtney Addabbo, NDPuyallup, WA1003349200

Common questions

What is Katherine Mattax, ND's NPI number?

Katherine Mattax, ND's National Provider Identifier (NPI) is 1053023846, issued on Dec 23, 2022. An NPI identifies a provider in billing; it is not a license.

Where is Katherine Mattax, ND located?

The NPPES record lists a practice address at 5470 Shilshole Ave NW Ste 500, Seattle, WA, 98107. Phone: (206) 279-6390. Providers update this record themselves, so call before visiting.

How can I verify Katherine Mattax, ND's license?

Search the Washington board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Compiled from official public sources by the editorial process.

Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.