Headshot of Dr Steven Gruenstein M.D.

Languages: English, Italian

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

Patient Reviews

  • "All was very good"
      from Michael 5.0 Stars - (2024-05-15)
  • "I’m very happy with the service, from the front desk, to the nurse . Dr G in awesome Very friendly, explain in detail my problem, and the way that we fix it."
      from Avraham 5.0 Stars - (2024-05-11)
  • "There was a very short wait and blood drawn efficiently. Dr.G. was thoughtful and kind in explaining the reasons for more testing of the blood and the rest of the process of understanding the elevated LDH."
      from Diana 5.0 Stars - (2024-05-10)
  • "Always a positive experience."
      from Maggie 5.0 Stars - (2024-05-04)
  • "Dr. Gruenstein is a highly skilled hematologist who is also very compassionate and kind."
      from Linda 5.0 Stars - (2024-05-02)
  • "Wonderful Doctor and an Amazing Staff !"
      from jesus 5.0 Stars - (2024-04-30)
  • "Very professional and caring experience"
      from Rochelle 5.0 Stars - (2024-04-27)
  • "Crossing the river...from health to healthcare maintenence is a big step....I was subject to 7 vials of blood sample tests...then after the Doctors exam, 3 more! Mucho sangre, whats going on...after bloodwork analysis...I will feel comfortable proceeding in a 6 month Chemotherapy journey if I am not completely cancer free. My lymph nodes all were clear...I am not anxious to follow a computer report from some Doctors ideas with out full spectrum review/analysis."
      from Frank 3.0 Stars - (2024-04-20)
  • "Waiting for over a hour after my appointment to see the doctor and is not a first time it happened."
      from Pete 1.0 Stars - (2024-04-20)
  • "The staff is patient, efficient & clear both upon entry & afterwards for future appts.My blood work didn’t show change & therefore a simple “chat” with a PA precluded needing Dr. G’s consultation."
      from Sandra 5.0 Stars - (2024-04-19)