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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"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) -
"Very easy and always on time. Doctor is extra special"
from Marty 5.0 Stars - (2025-10-19) -
"Dr Gruenstein and the entire staff at NY Cancer and Blood specialists are wonderful professionals and people. I always feel welcome, and my care is always top notch. Thank you for being so patient, kind, and caring!"
from Jordy 5.0 Stars - (2025-09-26) -
"VERY BEST DR I HAVE EVER MET. COMPASSIONATE CONCERN CLEAR EXPLANATIONS.
EXCELLENT OFFICE"
from Barbara 5.0 Stars - (2025-09-26) -
"Dr. Gruenstein and his team have always treated me with expertise and compassion, and have had my well-being at the heart of all our interactions. When my symptoms and his testing did not reveal the cause of my illness, he did not hesitate to refer me to another specialist, but he stayed involved to ensure my treatment progressed successfully. I cannot thank them enough."
from Michael 5.0 Stars - (2025-09-21) -
"Efficient and professional excellence."
from Marcie 5.0 Stars - (2025-09-16) -
"Extremely knowledgeable, thorough and personable."
from Harold 5.0 Stars - (2025-09-16)