Individual provider · Type 1 NPI

Justin F. Gainor, MD

Medical Oncology Physician · Boston, MA

NPI number 1487813010 Active

Practice location

Massachusetts General Hospital, 55 Fruit Street
Boston, MA 02114

Other practice locations

  • 75 Francis St, Boston, MA 02115-6110 · (617) 724-4000
  • 1153 Centre St, Jamaica Plain, MA 02130-3446 · (617) 724-4000

Specialties and licenses

TaxonomyCodeLicense
Hematology (Internal Medicine) Physician 207RH0000X245561 (MA)
Internal Medicine Physician 207R00000XL-236372 (MA)
Medical Oncology Physician Primary 207RX0202X245561 (MA)

Medical Oncology Physician: An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.

866 other providers at this address

Other medical oncology physician providers in Boston

See all in Boston →

About NPI 1487813010

Justin F. Gainor, MD's National Provider Identifier is 1487813010, issued on Jun 9, 2008. The primary taxonomy on file is Medical Oncology Physician (207RX0202X), and the practice location is in Boston, MA. The record was last updated on Aug 11, 2026.