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Dr Steven Gruenstein

Medical Oncology & Hematology

Dr Steven Gruenstein is an Associate Clinical Professor of Medicine, in Hematology and Medical Oncology, at the Mount Sinai School of Medicine. He is an Attending Physician both at Mount Sinai and Lenox Hill.

Dr Gruenstein completed his sub specialty training at Beth Israel Hospital after which he became board certified in Medical Oncology, Hematology and earlier in Internal Medicine. He is a member of the American Society of Clinical Oncology, the American Society of Hematology, American Society of Breast Diseases among others.

Dr Gruenstein is recognized throughout the NY Metropolitan as an outstanding clinical Hematologist/Oncologist dedicated to his patients’ wellbeing. He is their advocate. He is also known for kindness and compassion which is evident immediately upon meeting him. He has been honored with citations in New York Magazine’s Best Doctor’s, Castle Connelly’s Best Doctors in US and NY, Patients’ Choice and Compassionate Doctor’s Awards. He has been described, interviewed and quoted in books, magazines and newspapers. He has published extensively in his field.

Dr. Gruenstein is especially interested in hematological malignancies, benign hematology and solid tumors especially gastrointestinal, genitourinary and breast cancer. He treats other cancers as well, and is an expert in benign hematology. He teaches at both Mount Sinai and Lenox Hill, lecturing on many topics, directing tumor boards and serving on various hospital administrative boards. For patients seeking more time and personalized attention, Dr Gruenstein offers a special Concierge Service.

Credentials:  M.D.
Education & Training
   FACP:    Beth Israel Medical Center
    Residency:    Metropolitan Hospital Center
    Medical School:    University of Genoa
    College:    Yeshiva University


Lenox Hill Hospital
Mount Sinai Manhattan

Patient Reviews

  • "The staff was friendly and helpful"
      from Quintina 5.0 Stars - (2024-10-01)
  • "Very kind and patient Doctor. I felt relaxed communicating with him."
      from Sylvester 4.0 Stars - (2024-09-28)
  • "We seeing this place yesterday with my wife Nusha and we very glad with the service and treatment. Hope will have more places like this. Keep up the good work. Thank you."
      from Mikel 5.0 Stars - (2024-09-27)
  • "Overall professionalism and attention to my needs and concerns"
      from Theodore 5.0 Stars - (2024-09-26)
  • "The office visit was definitely more efficient than prior visits I was seen relatively quickly once I arrived I was seen by Dr Gruenstein s PA shortly after they took my vitals and after her consultation Dr Gruenstein greeted me shortly after that"
      from ANDREW 5.0 Stars - (2024-09-26)
  • "Being a patient of Dr. Gruenstein for more than 25 yrs for ITP, confirms how blessed I am to be in his care. He is 'the best of the best'!"
      from Lorraine 5.0 Stars - (2024-09-26)
  • "I love being treated like a celebrity."
      from Norm 5.0 Stars - (2024-09-19)
  • "I have two special needs children and including myself I’ve worked with several doctors over the past 40 yrs. Out of them all Dr. G is the best doctor that treated me. Look no further. You can thank me later!!! PS: I was having a crappie day. Dr .G had me laughing 🤣 and treating me at the same time almost didn’t want to leave."
      from D 5.0 Stars - (2024-09-13)
  • "Caring brilliant empathic. The best!!"
      from Rona 5.0 Stars - (2024-09-13)
  • "Great caring Great empathy Dr Gruenstein gives you his best"
      from Philip 5.0 Stars - (2024-09-06)