Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Zachary Charles Mattes, MD

Individual provider Hospitalist Physician · NPI 1841644432

Zachary Charles Mattes, MD is a Hospitalist in Seattle, Washington. Graduated from Saint Louis University School of Medicine in 2016, 10 years ago. Practices with Franciscan Medical Group, a 1,417-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
10
Trained at
Saint Louis University School of Medicine
Licensed in
WA
In the registry since
2016
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1101 Madison St Ste 301
Seattle, WA 98104-3599
Phone: (206) 505-1300
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • Virginia Mason Medical Center 925 Seneca St, Seattle, WA 98101 — (206) 515-5811

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence MD60974864 (WA)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD60974864 (WA)

Record details

NPI number1841644432
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 20, 2016
Last updated in NPPESJune 17, 2021
Certification dateJune 17, 2021

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Also practisesINTERNAL MEDICINE
Medical schoolSAINT LOUIS UNIVERSITY SCHOOL OF MEDICINE
Graduated 2016 (10 years in practice)
Group practice Franciscan Medical Group — 1417 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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