RAY MUN KOO
NPI 1942166327
Internal Medicine - Hematology & Oncology in Seattle, WA
About Ray Mun Koo NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
RAY MUN KOO (NPI 1942166327) is an individual hematology & oncology provider in Seattle, Washington, licensed in Washington (TR70062707) and active in the NPI registry since December 2025. The provider is enrolled in Medicare PECOS, is affiliated with University Of Washington Medical Ctr, and is a graduate of Other (2012).
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Ray Mun Koo 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.
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 98109 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 98109
SEATTLE, WA 98109
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 Ray Mun Koo's NPI number?
The NPI number for Ray Mun Koo is 1942166327. It was assigned to this individual provider in the NPPES registry on December 30, 2025.
Where is Ray Mun Koo located?
Ray Mun Koo practices at 825 Eastlake Ave E, Seattle, WA 98109. The listed phone number is (206) 520-5000.
What is Ray Mun Koo's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Ray Mun Koo enrolled in Medicare?
Yes. Ray Mun Koo 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.
Is Ray Mun Koo affiliated with any hospitals?
According to CMS data, Ray Mun Koo is affiliated with University Of Washington Medical Ctr.
When was this NPI record last updated?
The NPPES record for Ray Mun Koo was last updated on December 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Ray Mun Koo · NPI 1942166327
Hematology & Oncology physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since December 30, 2025.
## Identity
- **NPI:** 1942166327 (Entity type: Individual)
- **Enumerated:** December 30, 2025
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** TR70062707 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 825 EASTLAKE AVE E, Seattle, WA 98109-4405
- **Phone:** (206) 520-5000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** December 30, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1942166327) · Data from the CMS NPPES public registry.