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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"Everyone was professional and informative."
from Judi 5.0 Stars - (2024-12-02) -
"I had no problem making appointment, and the staff and doctor did their best to put me at ease."
from Carole 5.0 Stars - (2024-11-28) -
"I was delighted to meet the team of doctors who are taking care of me. I forgot my illness when I see you. The care, the sense of humor. The similar mentality and culture.
I would like to thank you for making me feel better. Hoping we could meet in a social event soon to express my gratitude. God bless....
Picture in Lebanon 5 years ago at a ski resort"
from Elias 4.0 Stars - (2024-11-26) -
"Can’t say enough about my Doctor, Dr. Gruenstien and his, my care team. The level of care and concern is exceptional. I’ve met some of the best people in all departments and can’t express my thanks enough. My tumor marker, the ca125 in the course of one month dropped 53.7 points. Nothing in this world is perfect, but my Doctor, care team and nurses here come pretty close to it. Let me not forget the receptionists who greet us, everyone, they are the nicest and kindest women I’ve met in my journey that began in 2019. Glad my Primary Care sent me here in 2024,
Life has never been better on my journey than it is now."
from Rita 5.0 Stars - (2024-11-26) -
"Smooth on time appointment. Courteous care and fantastic doctor!"
from Barry 5.0 Stars - (2024-11-24) -
"I thoroughly love & respect Dr Gruenstein. He is knowledgeable,kind & caring. He has been an important part of my medical team for many years. I am grateful to him & HIGHLY RECOMMEND HIM. ELAINE YATZKAN, PhD"
from Elaine 5.0 Stars - (2024-11-21) -
"Excellent"
from Mary 5.0 Stars - (2024-11-20) -
"Amazing staff, incredibly knowledgeable and puts your mind at ease. Dr Gruenstein is the absolute BEST there is."
from Johanna 5.0 Stars - (2024-11-19) -
"Can’t say enough about this practice!! Dr.Gruenstein is a rare find and is staff is wonderful!!! I live in CT…and if I lived in CA…I’d still get to him!!!"
from Sheri 5.0 Stars - (2024-11-14) -
"Dr. Gruenstein is not only a very good doctor, he is a caring and loving person. It is my good fortune to have him as my doctor."
from tova 5.0 Stars - (2024-11-07)