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Gregory Colburn, MD
NPI 1538235056 · Radiation Oncology Physician · San Jose, CA
Gregory Colburn, MD is a Radiation Oncology Physician provider in San Jose, CA (NPI 1538235056).
Provider details
- NPI number
- 1538235056
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G057384 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
2105 Forest Avenue
Oconnor Hospital
San Jose, CA 95128
Phone: (408) 947-2995
Fax: (408) 947-2687
Street-level locationGet directions
Mailing address
Po Box 5040
San Jose, CA 95150
Registry dates
- Enumerated
- 2006-11-27
- Last updated
- 2007-07-08
Frequently asked questions
- What is Gregory Colburn's NPI number?
- Gregory Colburn's National Provider Identifier (NPI) is 1538235056, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Colburn's specialty?
- Gregory Colburn is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Colburn located?
- Gregory Colburn's practice location on file with NPPES is 2105 Forest Avenue, San Jose, CA 95128.
- What is Gregory Colburn's phone number?
- The practice phone number listed in the NPPES registry for Gregory Colburn is (408) 947-2995.
- Is Gregory Colburn's NPI active?
- Yes — Gregory Colburn's NPI (1538235056) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.