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

Gregory O Colburn, MD

Individual provider Radiation Oncology Physician · NPI 1538235056

Gregory O Colburn, MD is a Radiation Oncology Physician in San Jose, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
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

2105 Forest Avenue Oconnor Hospital
San Jose, CA 95128
Phone: (408) 947-2995
Fax: (408) 947-2687
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Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence G057384 (CA)

Record details

NPI number1538235056
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 27, 2006
Last updated in NPPESJuly 8, 2007
Mailing addressPo Box 5040, San Jose, CA 95150

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