Doctor profile · Federal record
Dr. Gregory Sibley, M.D.
Radiation Oncology Physician (CMS: Radiation Oncology) · Fairfax, VA
- NPI 1043211360
- Accepts Medicare
- MIPS 89.8 / 100 · 2023
- 36 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
8613 Route 29 Ste 100N
Fairfax, VA 220312172
(571) 350-8400
fax (703) 280-9596 - Mailing address
-
3040 Williams Dr Ste 100
Fairfax, VA 220314618
Credentials & registration
- NPI registered
- August 2005 — 21 yrs on file
- Profile last updated
- November 11, 2025
- Year of graduation
- 1990 — 36 yrs since
- Specialty taxonomy
- 2085R0001X — NUCC code
- State license (1)
- Virginia #0101052359
- Medicaid
- DC #5821738
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1043211360. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
13,816
Distinct HCPCS
10
Medicare allowed
$3,097,848
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
A9607 |
Lutetium lu 177 vipivotide tetraxetan, therapeutic, 1 millicurie | 8,200 | 24 | $256 | |
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 | $436 | |
77014 |
Ct guidance for insertion of radiation therapy fields | 485 | 70 | $65 | |
77300 |
Calculation of radiation therapy dose | 364 | 123 | $75 | |
77334 |
Design and construction of complex radiation treatment device | 271 | 84 | $140 | |
G6012 |
Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 6-10 mev | 267 | 38 | $279 | |
77336 |
Continuing radiation therapy consultation per week | 240 | 124 | $104 | |
77427 |
Radiation treatment management, 5 treatment sessions | 213 | 100 | $212 | |
G6013 |
Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 11-19 mev | 151 | 42 | $285 |
In context: peer comparison
Among 7 peers in Fairfax Radiation Oncology Physician, average services per provider: 233. This provider delivers 59× the peer median.Open Payments
Industry payments received
All-time total
$190
Transactions
3
Manufacturers
3
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Myriad Genetic Laboratories, INC. | 1 | $130.04 | |
| AstraZeneca Pharmaceuticals Lp | 1 | $34.21 | |
| Novartis Pharmaceuticals Corporation | 1 | $25.92 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
52
Patients
13
Total drug cost
$35,497
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Tamsulosin Hcl | Generic | 39 | 13 | $833 |
| Orgovyx (Relugolix) | Brand | 13 | 0 | $34,664 |
Frequently asked questions
What is Dr. Gregory Sibley's medical specialty?
Dr. Gregory Sibley practices Radiation Oncology Physician in Fairfax, VA.
Where does Dr. Gregory Sibley practice?
Dr. Gregory Sibley practices at 8613 Route 29 Ste 100N, Fairfax, VA 220312172. Office phone: 5713508400.
What is Dr. Gregory Sibley's NPI?
Dr. Gregory Sibley's National Provider Identifier (NPI) is 1043211360, issued by NPPES.
Does Dr. Gregory Sibley accept Medicare assignment?
Yes. Dr. Gregory Sibley accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gregory Sibley commonly perform?
Top Medicare-reported procedures in 2023: Lutetium lu 177 vipivotide tetraxetan, therapeutic, 1 millicurie (HCPCS A9607); Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml (HCPCS Q9967); Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc (HCPCS G6015). Source: CMS Medicare Physician & Other Practitioners file.