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.
| Central Park Medical Oncology | 12 E 86th Street, Suite #4, New York, NY 10028 | 212-861-6660 |
| Yorkville Medical Oncology | 210 E 86th Street, 6th Floor, New York, NY 10028 | 212-861-6660 |
| Lenox Hill Hospital |
| Mount Sinai Manhattan |
Patient Reviews
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"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) -
"The staff are very professional. The doctor explained everything in very simple details and answered all my questions and concerns. Basically they provided a world class experience."
from Mohamed 5.0 Stars - (2025-10-31) -
"I am extremely grateful to have been treated at NY Cancer & Blood Specialists in Manhattan. I find Dr Gruenstein exceptional, it’s hard to describe he provides clear, firm advice in a passionate way which really worked for me. The vibe at his office is extremely professional and positive, thanks to the front desk, admins, staff, nurses and doctors. I highly recommend them."
from Xavier 5.0 Stars - (2025-10-31) -
"Dr Gruenstein is smart , empathetic and always pleasant. I know that I can always contact him if something comes up and I will get a quick response."
from Hal 5.0 Stars - (2025-10-30) -
"Knowledgeable, competent, friendly, honest"
from Arnold 5.0 Stars - (2025-10-25) -
"My appointments, always on time. Every body is nice"
from Sandra 4.0 Stars - (2025-10-23) -
"The doctor's attitude deserves special attention, professional approach, consultation, if necessary, involving specialists from other fields, in my case I also needed a consultation with a gastroenterologist and nephrologist, they gave a referral, thank you for providing great service"
from Vladyslav 5.0 Stars - (2025-10-23) -
"Dr G is extremely special!!
Professional in every sense of the word!!"
from ray 5.0 Stars - (2025-10-21)