DR. GREGORY S SIBLEY (M.D.) – Radiation Oncology Physician, NPI 1043211360
Radiation Oncology Physician
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Doctor Profile
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Profile Insights
NPPES metrics only — not quality of care.
136 RADIATION ONCOLOGY in VA
Provider Addresses for DR. GREGORY S SIBLEY (M.D.)
3040 WILLIAMS DR STE 100
FAIRFAX, VA 220314618
Phone: (571) 350-8400
Fax: (703) 280-9596
Type: Mailing
8613 ROUTE 29 STE 100N
FAIRFAX, VA 220312172
Phone: (571) 350-8400
Fax: (703) 280-9596
Type: Location
10301, Democracy Lane, Lord Fairfax Estates, Fairfax, Fairfax (city), Virginia, 22030, United States
FAIRFAX, VA 220302545
Phone: (703) 934-4450
Fax: (703) 934-5533
Type: Location
8613 LEE HWY
FAIRFAX, VA 220312171
Phone: (571) 350-8400
Fax: (703) 904-8692
Type: Location
3040, Williams Drive, Merrifield, Fairfax (city), Virginia, 22031, United States
SUITE 100
FAIRFAX, VA 220314618
Phone: (571) 350-8400
Fax: (703) 904-8692
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 5 Open Payments records for all available years, with a total value of $228.
Total Amount is formed as General ($228) + Research ($0) + Ownership ($0) = $228.
Last reported payment date: 2024-11-18 • Largest payer in this snapshot: Myriad Genetic Laboratories, Inc. ($130).
Total Amount
$228
General + Research + Ownership
Payments
5
Total payment records
General Amount
$228
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-18
Latest reported date
Top Companies
Largest payers in this snapshot
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2013-09-11
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20100308000136 | I | Radiation Oncology | DC | TBD |
| I20130911000013 | I | Radiation Oncology | VA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| A9607 | Lutetium lu 177 vipivotide tetraxetan, therapeutic, 1 millicurie | 8,200 | 24 | $0 |
| Q9967 | Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml | 1,876 | 17 | $0 |
| G6015 | Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment session | 642 | 73 | $0 |
| 77014 | Ct guidance for insertion of radiation therapy fields | 485 | 70 | $0 |
| 77300 | Calculation of radiation therapy dose | 364 | 123 | $0 |
Insurance plans in this area (ZIP 22031)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| RADIATION ONCOLOGY | VA | 77263 | Management of radiation therapy, complex | 124 | 118 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | VA | |
| Physician Assistant | VA | |
| - | VA | |
| Clinical Social Worker | VA | |
| Radiation Oncology | VA | |
| Hospice/Palliative Care, Internal Medicine, Hospice/Palliative Care | VA | |
| Hematology/Oncology, Internal Medicine | DC | |
| H E M A T O L O G Y/ O N C O L O G Y | VA | |
| - | NH | |
| Hematology/Oncology, Hematology | VA |
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