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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:  MD
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

  • "professional, well run office. Excellent Medical care and knowledge."
      from jill 5.0 Stars - (2025-08-05)
  • "The whole staff was wonderful 🥰🌹🙏🏼"
      from Joyce 5.0 Stars - (2025-08-05)
  • "My first visit with the doctor very pleasant also informative made me feel comfortable very hopeful of success in my upcoming treatment I also spoke to the Nurse Practitioner very helpful looking forward to her assistance overall the staff were extremely helpful"
      from Rosalinda 5.0 Stars - (2025-08-05)
  • "The people who work there are excellent from first to last."
      from Rita 5.0 Stars - (2025-07-25)
  • "He is simply the best doctor there is"
      from Charles 5.0 Stars - (2025-07-25)
  • "Excellent doctor glad we met him"
      from Arvinder 5.0 Stars - (2025-07-16)
  • "Dr Gruenstein is very professional, extremely knowledgeable , humble and sincere. He really cares about his patients . And he will go that extra mile to help u. He is able to think out of the box . This can make a big difference in ur care. I am so fortunate to have him as my doctor. Simply, he is “amazing”. RS"
      from rita 5.0 Stars - (2025-07-16)
  • "He is a very nice Doctor who cares about his patients and making us feel completely comfortable."
      from Lissette 5.0 Stars - (2025-07-16)
  • "My experience at Dr. Gruenstein’s offices was pleasant and agreeable. The staff treated me well, they were professional and efficient. And, I am very grateful for their care. Unfortunately, I was referred to another experts for more test to figure out what is causing my symptoms."
      from Marie 4.0 Stars - (2025-07-15)
  • "He’s great."
      from James 5.0 Stars - (2025-07-12)