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

Mr. Ronan Wenhan Hsieh, MD

Individual provider Hematology & Oncology Physician · NPI 1457880031

Mr. Ronan Wenhan Hsieh, MD is a Hematology/Oncology in Seattle, Washington. Qualified in 2015, 11 years ago. Practices with Swedish Health Services, a 1,045-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Washington.

Years since qualifying
11
Licensed in
WA
In the registry since
2017
Specialties on file
2
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

1221 Madison St Fl 2
Seattle, WA 98104-3588
Phone: (206) 386-2323
Fax: (206) 215-6165
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence MD61396701 (WA)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD61396701 (WA)

Record details

NPI number1457880031
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 7, 2017
Last updated in NPPESFebruary 10, 2026
Certification dateFebruary 10, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHEMATOLOGY/ONCOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2015 (11 years in practice)
Group practice Swedish Health Services — 1045 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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