HealthCareAtlasUSA

This site republishes official CMS/Medicare Care Compare data. It is not medical advice and does not recommend any specific hospital or treatment — for medical decisions, talk to a doctor.

Doctors / VA

GREGORY S SIBLEY, MD

RADIATION ONCOLOGY

Medical school: UNIVERSITY OF MICHIGAN MEDICAL SCHOOL

Graduated: 1990

Offers telehealth

NPI: 1043211360

Practice Locations (2)

VIRGINIA CANCER SPECIALISTS, P.C.

8613 ROUTE 29, SUITE 100N

FAIRFAX, VA 220312172

7039344450

VIRGINIA CANCER SPECIALISTS, P.C.

9450 INNOVATION DR

MANASSAS, VA 201102214

5713508400

Source: CMS National Downloadable File, September 2026.