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Languages: English, Italian

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

  • "(Translated by Google) I have been serving there for many years. Everything remains the same Very good (Original) Tengo muchos años atendiendo hay. Todo sigue igual Muy bueno"
      from Digna 5.0 Stars - (2024-07-25)
  • "Dr.Gruenstein and the entire staff were knowledgeable, professional, personable, and efficient - I was very happy to have made an appointment."
      from Rosa 5.0 Stars - (2024-07-19)
  • "I like & respect Dr Gruenstein very much. He has been my doctor for many years and he has never disappointed me. I enthusiastically recommend him"
      from Elaine 5.0 Stars - (2024-07-18)
  • "Very pleasant visit. The staff , NP and phlebotomy team were all very good. Dr. Gruenstein is terrific. Many thanks"
      from Joseph 5.0 Stars - (2024-07-17)
  • "New patient but so far it deems like an efficient and professional office and Dr. Gruenstein was personable, professional, and straightforward with prognosis and details, all of which I appreciated."
      from Russell 5.0 Stars - (2024-07-17)
  • "Very professional yet fun and aware. Communicated and very informative"
      from Kelli 5.0 Stars - (2024-07-13)
  • "The PA and the nurses are great!"
      from Christian 4.0 Stars - (2024-07-11)
  • "Dr. Gruenstein is always thorough, thoughtful, and kind while giving a complete examination and review of all medical notes sent to him."
      from Mark 5.0 Stars - (2024-07-10)
  • "Skillful, informative, responsive, friendly! A wonderful health resource!!!"
      from Jonathan 5.0 Stars - (2024-06-25)
  • "Extremely knowledgeable, professional and kind… I’ve seen sooooo many doctors in NYC and he is definitely my favorite…not only in treatments + care, but also in tactful levity that is a breath of fresh air. Most importantly, I’m treated like a human being and not a slab of meat entered into the factory that feels like what healthcare has turned into"
      from Tamara 5.0 Stars - (2024-06-14)