Internal Medicine, Medical Oncology · Boston, MA
NPI
1487813010
Since 2008
Specialty
Internal Medicine, Medical Oncology
Code 207RX0202X
Group practices
3
Medicare group memberships
Hospitals
4
Hospital affiliations
Massachusetts General Hospital, 55 Fruit Street
Boston, MA, 02114
Phone (617) 726-2862
Groups this clinician bills Medicare through
Medicare paid, 2024
$63K
809 services
Medicare patients, 2024
171
Average age 73
Drug cost, 2024
$729K
190 prescriptions
Company payments, 2025
$56K
From 17 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by Justin F Gainor was code 99215 (office e&m - established), 224 times for 74 patients. In total Justin F Gainor billed 809 services in 11 codes, and Medicare paid $63K.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2026-08-11.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 99215 Office E&M - Established | Facility | 224 | 74 | $115.51 | $26K |
| G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's | Facility | 170 | 55 | $13.82 | $2,349 |
| 99233 Hospital E&M - Subsequent | Facility | 114 | 37 | $98.36 | $11K |
| G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's | Office | 66 | 42 | $13.82 | $912 |
| 99214 Office E&M - Established | Office | 54 | 33 | $108.57 | $5,863 |
| 99214 Office E&M - Established | Facility | 49 | 31 | $75.54 | $3,701 |
| 99215 Office E&M - Established | Office | 38 | 27 | $155.06 | $5,892 |
| 99238 Hospital Discharge Management | Facility | 18 | 18 | $67.98 | $1,224 |
| 99213 Office E&M - Established | Office | 17 | 15 | $67.42 | $1,146 |
| 99223 Hospital E&M - Initial | Facility | 12 | 12 | $143.57 | $1,723 |
By year: 2022 $54K for 539 services; 2023 $49K for 483 services; 2024 $63K for 809 services.
Medicare prescription drug claims, 2024
In 2024, the drug Justin F Gainor prescribed most often to Medicare patients was Dexamethasone, with 13 prescriptions and refills. In total Justin F Gainor wrote 190 Medicare prescriptions that cost $729K.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Dexamethasone Generic | 13 | 14 | Under 11 | $264 |
| Zykadia Ceritinib | 13 | 13 | Under 11 | $115K |
| Tabrecta Capmatinib Hydrochloride | 12 | 12 | Under 11 | $258K |
| Oxycodone Hcl Generic | 11 | 11 | Under 11 | $91.66 |
Brand drugs: 60 claims; generic drugs: 130 claims; opioid claims: 15.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid Justin F Gainor $56K ($56K in general payments such as food, travel and fees) from 17 companies. The largest payer was Pfizer Inc. with $21K.
| Company | Payments | Amount |
|---|---|---|
| Pfizer Inc. PFE | 11 | $21K |
| Genentech USA, Inc. ROG.SW | 3 | $13K |
| Roche Diagnostics Corporation ROG.SW | 1 | $4,942 |
| Merck Sharp & Dohme LLC MRK | 4 | $3,450 |
| Janssen Biotech, Inc. JNJ | 2 | $2,653 |
| EMD Serono, Inc. MRK.DE | 2 | $2,540 |
| Rigel Pharmaceuticals, Inc. RIGL | 3 | $2,188 |
| Janssen Scientific Affairs, LLC JNJ | 1 | $2,115 |
| AstraZeneca Pharmaceuticals LP AZN | 2 | $2,093 |
| Ventana Medical Systems, Inc. ROG.SW | 1 | $2,000 |
Official US government data on Original Medicare services, Medicare prescription drug plans and the payments drug and device companies must report. Services with fewer than 11 patients and drugs with fewer than 11 claims are not published. Procedure codes are shown by number with their public category.