Mary Siemon, RN ARNP
NPI 1891802641 · Nurse Practitioner · Seattle, WA
Mary Siemon, RN ARNP is a Nurse Practitioner provider in Seattle, WA (NPI 1891802641).
Provider details
- NPI number
- 1891802641
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RN ARNP
- Sex
- Female
- Sole proprietor
- No
- License
- RN00048036 (WA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-25
- Last updated
- 2025-09-11
Frequently asked questions
- What is Mary Siemon's NPI number?
- Mary Siemon's National Provider Identifier (NPI) is 1891802641, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Siemon's specialty?
- Mary Siemon is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Siemon located?
- Mary Siemon's practice location on file with NPPES is 180 Nickerson St, Seattle, WA 98109-1631.
- What is Mary Siemon's phone number?
- The practice phone number listed in the NPPES registry for Mary Siemon is (206) 284-8963.
- Is Mary Siemon's NPI active?
- Yes — Mary Siemon's NPI (1891802641) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.