The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Medicare assignment not listed

CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”

Guide: What Medicare assignment means

No telehealth indicator

CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.

Guide: How Medicare covers telehealth

Compared with the same specialty in Seattle and Washington

406 active clinicians are listed under Behavior Analyst with a practice address in Seattle, WA (2,981 in Washington).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Seattle

0% of these 406 clinicians have the CMS telehealth indicator.

0% of these 406 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo · Report an error.

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2026-02-10

Behavior Analyst Primary Specialty

NUCC Taxonomy Code: 103K00000X

License # reported to NPPES WA BA60777150

A behavior analyst is qualified by at least a master's degree and Behavior Analyst Certification Board certification and/or a state-issued credential (such as a license) to practice behavior analysis independently. Behavior analysts provide the required supervision to assistant behavior analysts and behavior technicians. A behavior analyst delivers services consistent with the dimensions of applied behavior analysis. Common services may include, but are not limited to, conducting behavioral assessments, analyzing data, writing and revising behavior-analytic treatment plans, training others to implement components of treatment plans, and overseeing implementation of treatment plans.

Assistant Behavior Analyst

NUCC Taxonomy Code: 106E00000X

An assistant behavior analyst is qualified by Behavior Analyst Certification Board certification and/or a state-issued license or credential in behavior analysis to practice under the supervision of an appropriately credentialed professional behavior analyst. An assistant behavior analyst delivers services consistent with the dimensions of applied behavior analysis and supervision requirements defined in state laws or regulations and/or national certification standards. Common services may include, but are not limited to, conducting behavioral assessments, analyzing data, writing behavior-analytic treatment plans, training and supervising others in implementation of components of treatment plans, and direct implementation of treatment plans.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Washington State Department of Health Provider Lookup.

Look Up on State Board Site

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

11 Historical Events

📍

Updated Practice Location February 10, 2026

Registered at 6523 CALIFORNIA AVE SW STE 19, SEATTLE, WA 981361833 (Tel: 2533704780)

📍

Updated Business Mailing Address February 10, 2026

Registered at 5417 96TH AVENUE CT NW, GIG HARBOR, WA 983356094 (Tel: 2533704780)

👤

Provider Name / Credentials Updated February 10, 2026

Recorded as KATHRYN STEWART, BCBA, LBA

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) February 10, 2026

Behavior Analyst (license number reported to NPPES: WA BA60777150)

📍

Updated Practice Location August 27, 2023

Registered at 1570 WILMINGTON DR STE 220, DUPONT, WA 983278773 (Tel: 2533704780)

✅

NPI Profile Active October 31, 2016

NPI status registered as active in NPPES database

📍

Practice Location (Initial Record) October 31, 2016

Registered at 5416 RAY NASH DR NW, GIG HARBOR, WA 983355973 (Tel: 2533704780)

📍

Business Mailing Address (Initial Record) October 31, 2016

Registered at 5416 RAY NASH DR NW, GIG HARBOR, WA 983355973 (Tel: 2533704780)

👤

Provider Name / Credentials (Initial Record) October 31, 2016

Recorded as KATHRYN STEWART

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) October 31, 2016

Assistant Behavior Analyst

🟢

Initial NPI Registration & Enumeration March 19, 2015

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1508250242

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: March 19, 2015

Last Update: February 10, 2026

Sole Proprietor: Yes

Update or Correct Profile

Mailing Address

5417 96th Avenue Ct Nw

Gig Harbor, WA 983356094

Phone: 2533704780

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.