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

Dr. Gregory S Sibley, MD

Individual provider Radiation Oncology Physician · NPI 1043211360

Dr. Gregory S Sibley, MD is a Radiation Oncology in Fairfax, Virginia. Graduated from University of Michigan Medical School in 1990, 36 years ago. Practices with Virginia Cancer Specialists, PC, a 79-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Virginia.

Years since qualifying
36
Trained at
University of Michigan Medical School
Licensed in
VA
In the registry since
2005
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

8613 Route 29 Ste 100N
Fairfax, VA 22031-2172
Phone: (571) 350-8400
Fax: (703) 280-9596
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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 0101052359 (VA)

Record details

NPI number1043211360
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 9, 2005
Last updated in NPPESNovember 11, 2025
Certification dateNovember 11, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyRADIATION ONCOLOGY
Medical schoolUNIVERSITY OF MICHIGAN MEDICAL SCHOOL
Graduated 1990 (36 years in practice)
Group practice Virginia Cancer Specialists, P.C. — 79 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

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