Quick answers
- Which hospitals does Ray Mun Koo work at?
- Medicare's official clinician data lists Ray Mun Koo at 1 hospital: University of Washington Medical Ctr. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ray Mun Koo see patients?
- Medicare's clinician data lists 1 practice location in Seattle, WA. Call before your visit to confirm the address.
- What is Ray Mun Koo's specialty?
- Medicare lists Hematology/Oncology as the primary specialty, and also Internal Medicine.
- Does Ray Mun Koo accept Medicare assignment?
- Yes. Medicare's clinician data says Ray Mun Koo accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Ray Mun Koo?
- (206) 288-1000, as listed in official Medicare / NPI Registry data.
- What is Ray Mun Koo's NPI number?
- 1942166327. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ray Mun Koo works
Medicare's Facility Affiliation Data lists Ray Mun Koo at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- University of Washington Medical CtrSeattle, WA · Acute Care Hospital · CCN 500008
Practice locations
Addresses where Ray Mun Koo is enrolled with Medicare (CMS data updated 2026-10-02).
- 825 Eastlake Ave ESeattle, WA 98109 (206) 288‑1000
Group practices
Medicare enrollment lists Ray Mun Koo as a member of this group (CMS data updated 2026-10-02).
- The Association of University Physicians3,535 clinicians in the group
Specialties
- Hematology/Oncologyprimary
- Internal Medicinealso
Other hematologist-oncologists in Seattle
Clinicians with the same Medicare primary specialty in Seattle, WA — not a recommendation.
Clinician information
| Graduation year | 2012 |
|---|---|
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1942166327 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians