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Dr. Justin Gainor, MD

Dr. Justin Gainor, MD

Age 39 Medical Oncology M
(3) 3 reviews
Accepting New Patients


Dr. Justin Gainor, MD is a medical oncology specialist in Boston, MA. He currently practices at Massachusetts General Hospital and is affiliated with Massachusetts General Hospital. He accepts multiple insurance plans. Dr. Gainor is board certified in Internal Medicine.

Insurance Accepted

  • Aetna
  • Anthem
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of Massachusetts
  • CareFirst Blue Cross Blue Shield
  • Cigna
  • First Health (Coventry Health Care)
  • Harvard Pilgrim Health Care
  • Humana
  • Tufts Health Plan

* Please verify this information when scheduling an appointment.


  1. Practice

    1. 1
      Massachusetts General Hospital
      55 Fruit St # 7b, Boston, MA 02114 Existing Patients: (617) 724-4000
  1. Lawrence House

    1. 2
      Massachusetts General Hospital
      10 Grove St, Boston, MA 02114 Existing Patients: (617) 726-0711

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Dr. Gainor is truly the best there is. He has been recognized by his peers numerous times, and still makes sure his patients get nothing but the BEST care. He has been treating our Mom for the past 4 years (non-small cell lung cancer, stage 4), and is always willing to spend as much time as needed answering all of our questions. He explains everything in a way we understand, and is always willing to go the extra mile. He has spoken with me over the phone multiple times when I cannot attend an appointment with my Mom, and he is never rushing to end the conversation. He is at the top of his field in research and patient care. You will not regret your choice to have him treat you.
— Jun 13, 2019
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Dr. Justin Gainor, MD
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Frequently Asked Questions

Dr. Gainor frequently treats Lung Cancer, Pulmonary Disease, and Secondary Malignancies.  

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Hospital Affiliations

  • Massachusetts General Hospital
  • Saint Francis Hospital