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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"Dr Steven Gruenstein has a warm, approachable bedside manner and listens to all your concerns. He is meticulous and comprehensive in his search for causation of illness. I always look forward to my visits with Dr Gruenstein."
from man 5.0 Stars - (2025-01-09) -
"The greatest service staff
The fantastic caring doctor"
from Sharon 5.0 Stars - (2025-01-03) -
"Excellent customer service, clean, not a long wait time. Very comforting"
from Philip 5.0 Stars - (2025-01-01) -
"Hands down the scammiest doctor I have ever encountered. Not only was he creepy and inappropriate during my in-person visit, but he insisted on doing a full hematology panel (far beyond what I had been referred for or had been expecting), which as I had feared, resulted in a huge surprise medical bill.
To interpret my results (which were very simple), Gruenstein's office insisted I set up an in-person visit, which was unnecessary. I asked for a remote visit, and when they finally allowed that, no one contacted me at the scheduled time. His nurse finally called me, 45 minutes late, and "explained" my results, which I had already received online, for 30 seconds. I was billed $300 for this "visit".
I will never go back to this office - total scam and was a very uncomfortable experience."
from Audrey 1.0 Stars - (2024-12-30) -
"Dr.Gruenstein has been an amazing physician and caregiver. I feel safe and in expert hands while going through a challenging period. His bedside manner is incredible and no question is silly which is very comforting. Thank you Dr.G."
from Nancy 5.0 Stars - (2024-12-25) -
"(Translated by Google) Definitely the best doctor I have ever had! Very professional and with
Best human quality I have ever seen! ❤️
(Original)
Definitivamente el mejor doctor que he tenido ! Muy profesional y con la
Mejor calidad humana que haya visto ! ❤️"
from Nazaret 5.0 Stars - (2024-12-25) -
"Dr Gruenstein is the most amazing doctor. He’s absolutely hilarious which helps calm any nerves you have. He’s very smart and he is an extremely respectful person which reflects on his staff. The entire office is kind and caring. Most importantly, Dr Gruenstein cares about every patient. If your case is out of the ordinary, he doesn’t give up. I was turned away from many doctors because my case was “too complicated.” But, Dr Gruenstein continues to work with me and search for an answer. If you are looking for a hematologist and/or cancer specialist, Dr Gruenstein is 100% the guy to choose."
from Leah 5.0 Stars - (2024-12-24) -
"An excellent physician with whom to interact. He looks at every detail of my care and discusses the pros and cons of the various options with you. Wonderful personality"
from Ian 5.0 Stars - (2024-12-20) -
"dr. Greenstones a real pleasure and a comedian yesterday! He gave me time and
understood my concerns. a wonderful office."
from Bobbie 5.0 Stars - (2024-12-12) -
"Amazing. Everyone was so nice and helpful. The doctor had a great bedside manner and was extremely experienced. All in all an A+ experience"
from Sarah 5.0 Stars - (2024-12-12)