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

John C Blasko, MD

Individual provider Radiation Oncology Physician · NPI 1194748715

John C Blasko, MD is a Radiation Oncology Physician in Seattle, Washington. Licensed in Washington. Registered with an NPI since 2006.

Licensed in
WA
In the registry since
2006
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

1101 Madison Ste 1101 C/o Seattle Prostate Institute
Seattle, WA 98104
Phone: (206) 215-2480
Fax: (206) 215-2481
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence MD00016098 (WA)

Record details

NPI number1194748715
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 25, 2006
Last updated in NPPESJanuary 16, 2008
Mailing addressPo Box 3972, Seattle, WA 98124-3972

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