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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:  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

  • "Prompt, efficient, staff pleasant, Dr.Gruenstein and Nurse Practioner informative, sharp, reassuring"
      from Carol 5.0 Stars - (2025-12-12)
  • "My experience with Dr. Gruenstein and his staff has been excellent thus far. This was my third visit. Dr. Gruenstein is caring and reassuring. He discusses your diagnosis and treatment and addresses any questions you may have. I'm happy and grateful that he is my Hematologist/Oncologist."
      from VZ 5.0 Stars - (2025-12-12)
  • "Highly professional team in an friendly atmosphere."
      from Dominique 4.0 Stars - (2025-12-07)
  • "(Translated by Google) Excellent (Original) Excelente"
      from Luis 5.0 Stars - (2025-11-27)
  • "I am always impressed by the care he takes with his patients and with his knowledge."
      from Barry 5.0 Stars - (2025-11-22)
  • "It was very professional. I liked the way Dr. Grunstein came in and introduced himself and asked me some questions. The staff was very friendly and informative. ."
      from Sharon 5.0 Stars - (2025-11-22)
  • "Kind & Professional"
      from Helene 5.0 Stars - (2025-11-21)
  • "Dr. Gruenstein and his staff . The operation is world class. I am thankful every day that I can come to Dr. Gruenstein‘s office when needed. I know that I will have the best possible care."
      from Richard 5.0 Stars - (2025-11-05)
  • "A most caring and comforting doctor. Instills confidence and support"
      from Leeor 5.0 Stars - (2025-11-04)
  • "Excellent medical care. Very thorough."
      from Helen 5.0 Stars - (2025-11-01)