Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

William Marshall

Individual provider Physician Assistant · NPI 1427834779

William Marshall is a Physician Assistant in Everett, Washington. Qualified in 2024, 2 years ago. Practices with Optum Care Washington PLLC, a 685-clinician group and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
2
Licensed in
WA
In the registry since
2023
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Practice location Address checks out

3927 Rucker Ave
Everett, WA 98201-4833
Phone: (206) 860-5414
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Physician Assistant (primary) Taxonomy 363A00000X · Licence PA61605637 (WA)

Record details

NPI number1427834779
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedSeptember 4, 2023
Last updated in NPPESMay 2, 2026
Certification dateMay 2, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolOTHER
Graduated 2024 (2 years in practice)
Group practice Optum Care Washington Pllc — 685 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients35
Services billed 479 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Optum Care Washington PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 685 clinicians in the practice; 12 are shown here.

Other providers in Everett