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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

  • "Dr. Greenstone is enormously kind - I could nt have asked for a better first appointment."
      from Laura 5.0 Stars - (2025-04-23)
  • "Had a very positive impression of Dr. Gruenstein and NYCBS. Very well organized. Don’t like having to wait 3 weeks for treatment but I get that."
      from Helen 5.0 Stars - (2025-04-12)
  • "The young, beautiful, doctor or resident t or PA ( I’m embarrassed I don’t know her name)….. was the kindest, most intelligent, patient practitioner I’ve seen in a long time I was so impressed with her. Extremely competent with a beautiful bedside manner so to speak."
      from Heidi 5.0 Stars - (2025-04-09)
  • "The staff was extremely helpful. And of course my time with Dr Gruenstein was very informative and reassuring."
      from Michele 5.0 Stars - (2025-04-01)
  • "I had the pleasure of meeting with Dr. Gruenstein, he listens, provides time for any concerns that I might have. I rely on him to help me with my issues. Knowledgeable, caring and kind.Thank you Dr. Gruenstein for taking care of me!"
      from Reviewer 5.0 Stars - (2025-03-21)
  • "Dr. Gruenstein is a knowledgeable, well - informed physician who is patient, sensitive, and empathic. I feel my medical care is in good hands."
      from Sydney 5.0 Stars - (2025-03-11)
  • "Dr Gruenstein and his team are very courteous , they provide excellent care and they make you feel comfortable."
      from Anthony 5.0 Stars - (2025-03-08)
  • "Incredible humor and care! I've moved further away but still travel to see Dr. G!"
      from Lauren 5.0 Stars - (2025-03-01)
  • "Well organized,kind, thoughtful.efficient and knowledgeable"
      from Isabelle 5.0 Stars - (2025-02-22)
  • "Very attentive and funny He really makes you feel welcomed and taken care of. I would recommend him."
      from Sandra 5.0 Stars - (2025-02-21)