Justin F. Gainor, MD
NPI 1487813010ActiveIndividual· Internal Medicine, Medical Oncology· Boston, MA
Internal Medicine, Medical Oncology (MD) in Boston, Massachusetts, trained at Harvard Medical School (class of 2008). Their prescriptions cost Medicare Part D more than their services did: $728,581 for 190 claims, against $62,944 paid for services in 2024. Pfizer Inc. was the largest of 11 companies reporting payments in 2025, $55,650 in all, mostly consulting fees.
Overview
| NPI | 1487813010 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 9, 2008 |
| Last updated in NPPES | Aug 11, 2026 |
| Certified by provider | Aug 11, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | 245561 | MA |
| Internal Medicine, Hematology | 207RH0000X | 245561 | MA |
| Internal Medicine | 207R00000X | L-236372 | MA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Medical Oncology (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 171 |
|---|---|
| Services billed | 809 across 11 procedure codes |
| Paid by Medicare | $62,944 |
Part D prescriptions in 2024
| Prescriptions (claims) | 190 · 231 30-day fills |
|---|---|
| Patients | 45 |
| Total drug cost | $728,581 |
| Generic share | 68% of claims |
Education and affiliations
| Medical school | Harvard Medical School |
|---|---|
| Graduation year | 2008 |
| Medicare specialty | Medical Oncology |
| Secondary specialties | Hematology, Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Massachusetts General Physicians Organization IncBoston, MA · 3,558 clinicians
- Brigham and Womens Physicians Organization IncBoston, MA · 2,994 clinicians
- The General Hospital CorporationBoston, MA · 1,267 clinicians
Hospital affiliations
- Brigham and Women Faulkner HospitalJamaica Plain, MA
- Brigham and Women's HospitalBoston, MA
- Massachusetts General HospitalBoston, MA
- Newton-Wellesley HospitalNewton, MA
- North Shore Medical Center -Salem, MA
Other facilities
- Care Dimensions, IncHospice · Danvers, MA
Industry payments (Open Payments)
- 2025$55,650 · 31 payments from 11 companies
- 2024$55,688 · 43 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $20,610 | 11 |
| Genentech USA, Inc. | $13,018 | 3 |
| Roche Diagnostics Corporation | $4,942 | 1 |
| Merck Sharp & Dohme LLC | $3,450 | 4 |
| Janssen Biotech, Inc. | $2,653 | 2 |
What the 2025 payments were for
- Consulting Fee$43,070 · 15 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$9,147 · 4 payments
- Honoraria$2,055 · 1 payment
- Travel and Lodging$717.72 · 2 payments
- Food and Beverage$616.79 · 8 payments
- Education$43.25 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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