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

Individual provider Anesthesiology Physician · NPI 1225001290

Mary L Dion, MD is an Anesthesiology in Seattle, Washington. Graduated from University of Washington School of Medicine in 1975, 51 years ago. Practices with Matrix Anesthesia, Ps, a 87-clinician group and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
51
Trained at
University of Washington School of Medicine
Licensed in
WA
In the registry since
2006
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

1100 9th Ave
Seattle, WA 98101-2756
Phone: (206) 223-6600
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence MD00019339 (WA)

Record details

NPI number1225001290
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 9, 2006
Last updated in NPPESNovember 15, 2011

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolUNIVERSITY OF WASHINGTON SCHOOL OF MEDICINE
Graduated 1975 (51 years in practice)
Group practice Matrix Anesthesia, Ps — 87 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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