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Edit this profileAt a glance
- 8613 Route 29 Ste 100N, Fairfax, VA 22031
About Dr. Sibley
Gregory S. Sibley, M.D. practices radiation oncology in Fairfax, VA. Gregory is a 1990 graduate of University of Michigan Medical School. According to Medicare claims data, Gregory cared for 1,508 Medicare patients across 14,467 services. The services billed most often include lutetium lu 177 vipivotide tetraxetan, therapeutic, 1 millicurie, low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml, and intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment session. The provider's National Provider Identifier (NPI) is 1043211360.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (571) 350-8400
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
8613 ROUTE 29 STE 100N
Fairfax, VA 22031
Conditions Commonly Evaluated or Treated
Within Radiation Oncology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Cancer care
Most searched conditions
Benign condition
Blood and lymph cancer
Bone cancer
Brain tumors
Cancer emergencies
Chest cancer
Endocrine cancer
Eye cancer
Eye conditions
Foot conditions
Gastrointestinal cancer
- Anal cancer
- Bile duct cancer
- Colon cancer
- Esophageal cancer
- Gallbladder cancer
- Liver cancer
- Pancreatic cancer
- Stomach cancer
Gynecologic cancer
Head & neck cancer
Head and neck cancer
Metastatic cancer
Neurologic condition
Orthopedic conditions
Sarcoma
Skin cancer
Thoracic cancer
Urologic cancer
Vascular conditions
Procedures & services
Most searched procedures
Advanced radiation
Benign treatment
Brain radiation
Cancer treatment
Central nervous system
Consultation
External radiation
- Electron beam therapy
- Image-guided radiation (IGRT)
- IMRT (Targeted intensity radiation)
- RapidArc / VMAT radiation
- Total body irradiation (TBI)
Eye cancer treatment
Follow-up care
Heart treatments
Internal radiation
Pain and symptom relief
Particle therapy
Precision radiation
- Adaptive radiation therapy
- Heart-sparing breath hold radiation (DIBH)
- Spine radiosurgery
- Stereotactic body radiation (SBRT)
- Stereotactic radiosurgery (SRS)
- Tattoo-free radiation
Prostate cancer treatment
Prostate protection
Radiation therapy
Skin cancer treatment
Skin lymphoma treatment
Specialized radiation
Targeted isotopes
Targeted radiation drugs
Treatment planning
Procedures Most Often Billed to Medicare
14,467 services · 1,508 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Ct guidance for insertion of radiation therapy fields | Imaging | 77014 |
458 | As often as other peers in Radiation Oncology |
| Calculation of radiation therapy dose | Imaging | 77300 |
394 | More often than most peers in Radiation Oncology |
| Design and construction of complex radiation treatment device | Imaging | 77334 |
259 | More often than most peers in Radiation Oncology |
| Continuing radiation therapy consultation per week | Imaging | 77336 |
216 | As often as other peers in Radiation Oncology |
| Radiation treatment management, 5 treatment sessions | Imaging | 77427 |
178 | As often as other peers in Radiation Oncology |
| Complex radiation therapy planning | Imaging | 77263 |
129 | More than most peers in Radiation Oncology |
| Cranial lesion surgery using radiation over multiple sessions | Imaging | 77373 |
128 | More often than most peers in Radiation Oncology |
| Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved | Imaging | 77290 |
77 | More than most peers in Radiation Oncology |
| 3d radiation therapy planning | Imaging | 77295 |
73 | More than most peers in Radiation Oncology |
| Design and construction of radiation treatment device for high precision radiation therapy | Imaging | 77338 |
71 | More often than most peers in Radiation Oncology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other radiation oncologists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 7
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 29 related providers in 4 groups
Other radiation oncologists in Fairfax 7
Same specialty, same city.
Trained at University of Michigan Medical School 8
Other providers in the same specialty who trained at the same institution.
Class of 1990 at University of Michigan Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Ct guidance for insertion of radiation therapy fields 6
Providers in VA who bill this service to Medicare most often.
Common questions
What is Gregory S. Sibley's specialty?
Gregory S. Sibley is a radiation oncologist in Fairfax, VA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Radiation Oncology”.
NPI registry
Where can I find Gregory S. Sibley?
Gregory S. Sibley is listed at 8613 Route 29 Ste 100N, Fairfax, VA 22031. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Gregory S. Sibley?
The number on file is (571) 350-8400. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Gregory S. Sibley's NPI number?
Gregory S. Sibley's National Provider Identifier is 1043211360. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Gregory S. Sibley's education?
Gregory S. Sibley attended University of Michigan Medical School, graduating in 1990. This comes from the CMS National Downloadable File.
CMS public data
How long has Gregory S. Sibley been practicing?
Gregory S. Sibley has 36 years experience. Calculated from a graduation year of 1990, reported in the CMS National Downloadable File.
CMS public data
What is Gregory S. Sibley known for?
According to Medicare billing data, Gregory S. Sibley performs imaging including ct guidance for insertion of radiation therapy fields and calculation of radiation therapy dose, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Gregory S. Sibley confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Gregory S. Sibley. If this is you, claiming it is free.
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