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

Mary Dawn Sienkiewicz, ARNP

Individual provider Registered Nurse · NPI 1245413533

Mary Dawn Sienkiewicz, ARNP is a Registered Nurse in Bellevue, Washington. Licensed in Washington. Registered with an NPI since 2007.

Licensed in
WA
In the registry since
2007
Specialties on file
2
What do these letters mean?
ARNP — Advanced Registered Nurse Practitioner
The title some states use for an advanced practice nurse.

See every abbreviation used in this directory →

Practice location Address checks out

1231 116th Ave NE Ste 950
Bellevue, WA 98004-3832
Phone: (206) 328-7734
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence AP30007980 (WA)
Registered Nurse Taxonomy 163W00000X · Licence RN00166727 (WA)

Record details

NPI number1245413533
Entity typeIndividual (Type 1)
GenderFemale
Credentials ARNP
Sole proprietorNo
NPI enumeratedDecember 10, 2007
Last updated in NPPESNovember 29, 2018

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