LEAH ELISABETH KARLSEN MD
NPI 1104408806
Internal Medicine in Seattle, WA
About Leah Elisabeth Karlsen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LEAH ELISABETH KARLSEN MD (NPI 1104408806) is an individual internal medicine provider in Seattle, Washington, licensed in Washington (MD61455824) and active in the NPI registry since April 2021. She is enrolled in Medicare PECOS, is affiliated with Swedish Medical Center / Cherry Hill, and maintains a secondary practice location in Seattle.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Leah Elisabeth Karlsen Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Leah Karlsen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Seattle, WA 98101
- Reassigned Medicare billing, Washington enrollment
- 663 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Swedish Medical Center / Cherry Hill
Acute Care Hospitals · Seattle, WASwedish Edmonds Hospital
Acute Care Hospitals · Edmonds, WASwedish Medical Center
Acute Care Hospitals · Seattle, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98107 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 14
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Leah Karlsen's NPI number?
The NPI number for Leah Karlsen is 1104408806. It was assigned to this individual provider in the NPPES registry on April 22, 2021.
Where is Leah Karlsen located?
Leah Karlsen practices at 5350 Tallman Ave NW Ste 301, Seattle, WA 98107. The listed phone number is (206) 386-2550.
What is Leah Karlsen's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Leah Karlsen enrolled in Medicare?
Yes. Leah Karlsen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Leah Karlsen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leah Karlsen reassigns Medicare benefits to Swedish Health Services (Seattle, WA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Leah Karlsen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Leah Karlsen accept?
Health plans from Ambetter Health, Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Leah Karlsen as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Leah Karlsen affiliated with any hospitals?
According to CMS data, Leah Karlsen is affiliated with Swedish Medical Center / Cherry Hill, Swedish Edmonds Hospital and Swedish Medical Center.
When was this NPI record last updated?
The NPPES record for Leah Karlsen was last updated on November 19, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Leah Elisabeth Karlsen, MD · NPI 1104408806
Internal Medicine physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since April 22, 2021.
## Identity
- **NPI:** 1104408806 (Entity type: Individual)
- **Enumerated:** April 22, 2021
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** MD61455824 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 5350 TALLMAN AVE NW STE 301, Seattle, WA 98107-5902
- **Phone:** (206) 386-2550
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Swedish Health Services (NPI 1073553947, Seattle, WA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Washington School Of Medicine, class of 2021
## Record status
- **NPPES last updated:** November 19, 2025
- **Other identifiers:** Medicaid 2188428 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1104408806) · Data from the CMS NPPES public registry.