Mary Dawn Sienkiewicz, ARNP
Nurse Practitioner · Bellevue, WA
Mary Dawn Sienkiewicz, ARNP is a nurse practitioner with a practice address in Bellevue, Washington, and NPI 1245413533, issued on Dec 10, 2007. Check the license (Washington AP30007980, as entered in NPPES) with the Washington board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Dawn Sienkiewicz
- Credential
- ARNP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License numbers
- AP30007980 WA
RN00166727 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1231 116TH Ave NE Ste 950, Bellevue, WA 98004
- Phone
- (206) 328-7734
- Enumerated
- Dec 10, 2007
- Record last updated
- Nov 29, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicaid ID
- 1089427 WA
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 2,308 in Washington → Look up another NPI →
Also registered at 1231 116TH Ave NE Ste 950
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jemma Nonog, ARNP, CNMAdvanced Practice Midwife1285155044
Verify Mary Dawn Sienkiewicz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Washington board licenses this profession
Search for license AP30007980Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The MIPS final score for 2023 (Medicare payment program): 93.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Mary Dawn Sienkiewicz among 2,308 nurse practitioner records in Washington
Mary Dawn Sienkiewicz, ARNP is one of 2,308 nurse practitioner records with a practice address in Washington. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 22% of them.
- NPI issued2007 · 22% of these records are older, 71% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileNo · 56% of these records are
- Record last updated2018 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nurse Practitioner providers in Washington
There are 2,308 nurse practitioner records in Washington.
All 2,308 in Washington → Every provider in Bellevue → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Polly Gardner, ARNPBellevue, WA 980041992759617
- Marcia Gordon, ARNPBellevue, WA 980041518934199
- Mary Hall, ARNPBellevue, WA 980041942318480
- Kier Jordan-Keith, M.N., A.R.N.P.Bellevue, WA 980041104938398
- Kate KennedyBellevue, WA 980041245309442
- Joy KnoppBellevue, WA 980041245315050
- Debra Laurent, ARNPBellevue, WA 980041275568057
- Denise Ledoux, A.R.N.P.Bellevue, WA 980041568473379
Common questions
What is Mary Dawn Sienkiewicz, ARNP's NPI number?
Mary Dawn Sienkiewicz, ARNP's National Provider Identifier (NPI) is 1245413533, issued on Dec 10, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mary Dawn Sienkiewicz, ARNP located?
The NPPES record lists a practice address at 1231 116TH Ave NE Ste 950, Bellevue, WA, 98004. Phone: (206) 328-7734. Providers update this record themselves, so call before visiting.
How can I verify Mary Dawn Sienkiewicz, ARNP's license?
NPPES lists Washington license number AP30007980, as entered by the provider. Search the Washington board that licenses this profession; the NPPES record confirms identity only.
What is Mary Dawn Sienkiewicz, ARNP's MIPS final score?
The 2023 MIPS final score is 93.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.