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

Individual provider Internal Medicine Physician · NPI 1427555416

Arielle Kloss, MD practises Internal Medicine in Seattle, Washington. Graduated from University of Washington School of Medicine in 2018, 8 years ago. Practices with St Vincent Hospital, a 332-clinician group and accepts Medicare assignment. Licensed in New Mexico.

Years since qualifying
8
Trained at
University of Washington School of Medicine
Licensed in
NM
In the registry since
2018
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

850 Republican St
Seattle, WA 98109
Phone: (206) 543-6806
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD2021-0514 (NM)

Record details

NPI number1427555416
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 6, 2018
Last updated in NPPESJuly 9, 2021
Certification dateJuly 9, 2021

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF WASHINGTON SCHOOL OF MEDICINE
Graduated 2018 (8 years in practice)
Group practice St Vincent Hospital — 332 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients253
Services billed 629 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at St Vincent Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 332 clinicians in the practice; 12 are shown here.

Other providers in Seattle