Gregory SibleyM.D.
Radiation Oncology·Fairfax, VA
Gregory Sibley, M.D. is a Radiation Oncology provider in Fairfax, VA, as of July 2026.
- NPI1043211360
- Registered2005
- Class of1990
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Education
Education on record as of August 2026.
Gregory Sibley at a glance
- Provider
- Gregory Sibley
- Credential
- M.D.
- Specialty
- Radiation Oncology
- Location
- Fairfax, VA
- Medical school
- University of Michigan Medical School
- Graduated
- 1990
- NPI registered
- 2005
- NPI
- 1043211360
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does Gregory Sibley practice?
Gregory Sibley, M.D. is based in Fairfax, VA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is Gregory Sibley's NPI number?
Gregory Sibley's National Provider Identifier (NPI) is 1043211360, registered in 2005. Specialty on record: Radiation Oncology; credential M.D.
Where did Gregory Sibley go to medical school?
Gregory Sibley, M.D. attended University of Michigan Medical School, graduating in 1990.
How many Radiation Oncology providers in Virginia work at ambulatory surgery centers?
18 Radiation Oncology surgeons and proceduralists in Virginia are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, Gregory Sibley among them. The Virginia Radiation Oncology directory lists each one by city with credential, NPI, and center affiliations.
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