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

Leah Elisabeth Karlsen, MD

Individual provider Internal Medicine Physician · NPI 1104408806

Leah Elisabeth Karlsen, MD practises Internal Medicine in Seattle, Washington. Graduated from University of Washington School of Medicine in 2021, 5 years ago. Practices with Select Outpatient Services Inc, a 790-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Washington.

Years since qualifying
5
Trained at
University of Washington School of Medicine
Licensed in
WA
In the registry since
2021
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

5350 Tallman Ave NW Ste 301
Seattle, WA 98107-5902
Phone: (206) 386-2550
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1959 Ne Pacific St, Seattle, WA 98195-0001 — (206) 543-3605

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD61455824 (WA)

Record details

NPI number1104408806
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 22, 2021
Last updated in NPPESNovember 19, 2025
Certification dateNovember 19, 2025

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 2021 (5 years in practice)
Group practice Select Outpatient Services Inc — 790 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients36
Services billed 105 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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. Those with a page here are linked.

Colleagues at Select Outpatient Services Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 790 clinicians in the practice; 12 are shown here.

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