Arielle Kloss, MD
Internal Medicine Physician · Seattle, WA
Arielle Kloss, MD is an internal medicine physician with a practice address in Seattle, Washington, and NPI 1427555416, issued on Apr 6, 2018. Check the license on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Arielle Kloss
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD2021-0514 NM
Self-reported in NPPES; status is on the state search - Practice location
- 850 Republican St, Seattle, WA 98109
- Phone
- (206) 543-6806
- Enumerated
- Apr 6, 2018
- Record last updated
- Jul 9, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20211026003208); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,079 in Washington → Look up another NPI →
Also registered at 850 Republican St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Cameron CuppCardiovascular Disease Physician1639872864
- Adrian Deleon, MDStudent in an Organized Health Care Education/Training Program1922702778
- David Hagin, M.D.General Practice Physician1790031573
- Leah Hawksford, MDStudent in an Organized Health Care Education/Training Program1730028242
- So Yeon HwangboStudent in an Organized Health Care Education/Training Program1922935360
- Ramita Karra, MDStudent in an Organized Health Care Education/Training Program1518464593
Verify Arielle Kloss in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical CommissionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average internal medicine physician in 2024
296 Medicare Part D claims for 124 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 22 claims were for opioids.
Most prescribed
- Atorvastatin Calcium31 claims
- Amlodipine Besylate19 claims
- Metoprolol Succinate16 claims
- Oxycodone Hcl16 claims
- Clopidogrel13 claims
- Tamsulosin Hcl12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- St Vincent HospitalSanta Fe, NM
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Arielle Kloss among 3,079 internal medicine physician records in Washington
Arielle Kloss, MD is one of 3,079 internal medicine physician records with a practice address in Washington. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 84% of them.
- NPI issued2018 · 84% of these records are older, 13% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2018 · median 2006 among the 1,852 with a school on file
- Record last updated2021 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
821 internal medicine physician records list a practice address in Seattle
They are 821 of the 41,956 NPPES records with a practice address in Seattle, and 3,079 internal medicine physician records in Washington.
All 3,079 in Washington → Every provider in Seattle → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rabiah Ali, M.D.Seattle, WA 981091780002170
- Katharine Bradley, MDSeattle, WA 981091720187586
- Hannah Hill, MDSeattle, WA 981091720642671
- Muhammad Idrees, MDSeattle, WA 981091720430127
- David Kauff, M.D.Seattle, WA 981091285785964
- Carl Mason, M.D.Seattle, WA 981091184787525
- John Morrison, MDSeattle, WA 981091780789594
- Dylan O'Shea, M.D.Seattle, WA 981091639604044
Common questions
What is Arielle Kloss, MD's NPI number?
Arielle Kloss, MD's National Provider Identifier (NPI) is 1427555416, issued on Apr 6, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Arielle Kloss, MD located?
The NPPES record lists a practice address at 850 Republican St, Seattle, WA, 98109. Phone: (206) 543-6806. Providers update this record themselves, so call before visiting.
How can I verify Arielle Kloss, MD's license?
Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Arielle Kloss, MD prescribe under Medicare Part D?
In 2024, Arielle Kloss, MD had 296 Medicare Part D claims for 124 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.