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

David Mason Siebert

Individual provider Sports Medicine (Family Medicine) Physician · NPI 1174866354

David Mason Siebert is registered under Family Practice in Seattle, Washington. Graduated from University of Chicago, Pritzker School of Medicine in 2013, 13 years ago. Practices with The Association of University Physicians, a 3,459-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
13
Trained at
University of Chicago, Pritzker School of Medicine
Licensed in
WA
In the registry since
2013
Specialties on file
2
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Practice location Address checks out

3800 Montlake Blvd NE
Seattle, WA 98195-8021
Phone: (206) 598-3294
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 314 Ne Thornton Pl, Seattle, WA 98125-9000 — (206) 528-8000

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence MD60584255 (WA)
Sports Medicine (Family Medicine) Physician Taxonomy 207QS0010X · Licence MD60584255 (WA)

Record details

NPI number1174866354
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedApril 5, 2013
Last updated in NPPESAugust 7, 2020
Certification dateAugust 7, 2020

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF CHICAGO, PRITZKER SCHOOL OF MEDICINE
Graduated 2013 (13 years in practice)
Group practice The Association Of University Physicians — 3459 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 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 patients113
Services billed 330 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $80 4 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at The Association of University Physicians

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3459 clinicians in the practice; 12 are shown here.

Other providers in Seattle