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.

See every abbreviation used in this directory →

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
Show map & directions

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

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