Quick answers
- Which hospitals does William Marshall work at?
- Medicare's official clinician data lists William Marshall at 1 hospital: Providence Regional Medical Center Everett. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William Marshall see patients?
- Medicare's clinician data lists 4 practice locations, including Everett, WA. Call before your visit to confirm the address.
- What is William Marshall's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does William Marshall accept Medicare assignment?
- Yes. Medicare's clinician data says William Marshall accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William Marshall?
- (425) 261-2000, as listed in official Medicare / NPI Registry data.
- What is William Marshall's NPI number?
- 1427834779. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William Marshall works
Medicare's Facility Affiliation Data lists William Marshall at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Providence Regional Medical Center EverettEverett, WA · Acute Care Hospital · CCN 500014
Practice locations
Addresses where William Marshall is enrolled with Medicare (CMS data updated 2026-10-02).
- 1321 Colby AveEverett, WA 98201 (425) 261‑2000
- 1330 Rockefeller AveEverett, WA 98201 (425) 259‑0966
- 3901 Hoyt AveEverett, WA 98201 (425) 339‑5442
- 3927 Rucker AveEverett, WA 98201
Group practices
Medicare enrollment lists William Marshall as a member of this group (CMS data updated 2026-10-02).
- Optum Care Washington PLLC683 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Everett
Clinicians with the same Medicare primary specialty in Everett, WA — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2024 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1427834779 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians