DR. ALEXANDER L SCALES MD
NPI 1437643541
Hospitalist in Seattle, WA
About Dr. Alexander L Scales Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ALEXANDER L SCALES MD (NPI 1437643541) is an individual hospitalist provider in Seattle, Washington, licensed in Washington (MD61425337) and active in the NPI registry since June 2018. He is enrolled in Medicare PECOS, is affiliated with University Of Washington Medical Ctr, and maintains a secondary practice location in Everett.
NPPES Registry Identity
Specialties & Licenses 2
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
Dr. Alexander L Scales 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 Reassignments
2Medicare enrollment records show Alexander Scales reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Seattle, WA 98109
- Reassigned Medicare billing, Washington enrollment
- 2,678 clinicians in this Medicare group
Seattle, WA 98104
- Reassigned Medicare billing, Washington enrollment
- 4,364 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 5
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Of Washington Medical Ctr
Acute Care Hospitals · Seattle, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98133 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SEATTLE, WA 98133
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 Alexander Scales's NPI number?
The NPI number for Alexander Scales is 1437643541. It was assigned to this individual provider in the NPPES registry on June 21, 2018.
Where is Alexander Scales located?
Alexander Scales practices at 1550 N 115th St, Seattle, WA 98133. The listed phone number is (206) 520-5000.
What is Alexander Scales's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Alexander Scales enrolled in Medicare?
Yes. Alexander Scales 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 organizations bill Medicare for Alexander Scales's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Scales reassigns Medicare benefits to 2 organizations: Kaiser Foundation Health Plan Of Washington (Seattle, WA) and The Association Of University Physicians (Seattle, WA). Each 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 Alexander Scales's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Alexander Scales accept?
Health plans from Premera Blue Cross Blue Shield of Alaska list Alexander Scales 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 Alexander Scales affiliated with any hospitals?
According to CMS data, Alexander Scales is affiliated with University Of Washington Medical Ctr.
When was this NPI record last updated?
The NPPES record for Alexander Scales was last updated on November 28, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.
# Dr. Alexander L Scales, MD · NPI 1437643541
Hospitalist physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since June 21, 2018.
## Identity
- **NPI:** 1437643541 (Entity type: Individual)
- **Enumerated:** June 21, 2018
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** MD61425337 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 1550 N 115TH ST, Seattle, WA 98133-8401
- **Phone:** (206) 520-5000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Kaiser Foundation Health Plan Of Washington (NPI 1396810701, Seattle, WA); The Association Of University Physicians (NPI 1023041159, Seattle, WA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2018
## Record status
- **NPPES last updated:** November 28, 2023
- **Other identifiers:** Other 029265 (CO)
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Source: [NPI Profile](https://npiprofile.com/npi/1437643541) · Data from the CMS NPPES public registry.