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

Dr. Mark Thomas Sonderman, MD

Individual provider Internal Medicine Physician · NPI 1578128658

Dr. Mark Thomas Sonderman, MD is an Internal Medicine Physician in Seattle, Washington. Licensed in Tennessee and Washington. Registered with an NPI since 2019.

Licensed in
TN, WA
In the registry since
2019
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

1959 NE Pacific St
Seattle, WA 98195-0001
Phone: (206) 520-5000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD61401126 (WA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 63952 (TN)

Record details

NPI number1578128658
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 5, 2019
Last updated in NPPESMay 2, 2023
Certification dateJuly 1, 2022

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 patients31
Services billed 70 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.

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