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.
| Lenox Hill Hospital |
| Mount Sinai Manhattan |
Patient Reviews
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"Caring and professional."
from Branko 5.0 Stars - (2025-05-18) -
"Amazing crew is always so comforting to go to the office Dr Gruensteim the best !"
from Miriam 5.0 Stars - (2025-05-16) -
"Excellent visit. This was my first time to see Dr. Gruestein.
I had a great first impression"
from Sergio 5.0 Stars - (2025-05-13) -
"Excellent doctor. Thorough and highly recommend"
from Aisha 5.0 Stars - (2025-05-07) -
"I felt confident in the care that I received. Dr. Gruenstein was very thorough and patient with all my questions."
from Darlene 5.0 Stars - (2025-05-06) -
"He a a great (old school) doctor with compassion and heart! A trait in doctors that is becoming extinct!
Would not trade him for anything!"
from Harry 5.0 Stars - (2025-05-03) -
"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)