About
Dr. Steven Gruenstein holds board certification in Medical Oncology, Hematology, and Internal Medicine. He serves as Associate Clinical Professor of Medicine in Hematology and Medical Oncology at the Mount Sinai School of Medicine. He completed his subspecialty training at Beth Israel Hospital and holds attending privileges at both Mount Sinai and Lenox Hill hospitals.
Dr. Gruenstein is especially passionate about breast cancer, hematologic malignancies, and GI malignancies. He also brings deep expertise in benign hematology and treats a broad range of other cancers. He teaches at both Mount Sinai and Lenox Hill, leading tumor boards and serving on hospital administrative boards. New York Magazine and Castle Connolly have both recognized him among the Best Doctors in the US and New York. He has earned Patients' Choice and Compassionate Doctor's Awards, and patients and colleagues alike note his warmth immediately. He also speaks Italian.
Education & Training
Fellowship
Subspecialty training, Beth Israel Hospital
Certifications
Languages
English, Italian
Conditions Treated
Who is Dr. Gruenstein right for?
Dr. Gruenstein is a strong fit for patients navigating a cancer diagnosis or complex blood disorder. Adults dealing with breast cancer, GI malignancies, or hematologic cancers benefit most from his focused expertise. Patients with benign hematologic conditions also find thorough, attentive care here. Those who want direct access to a senior physician and seamless specialist coordination will find his practice well-suited to their needs.
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Frequently Asked Questions
Dr. Gruenstein specializes in breast cancer, hematologic malignancies, and GI malignancies. He also treats a broad range of other cancers. His triple board certification in Medical Oncology, Hematology, and Internal Medicine gives him a comprehensive clinical foundation across these areas.
Yes, Dr. Gruenstein brings deep expertise in benign hematology. He evaluates and manages a wide range of non-cancerous blood disorders alongside his oncology practice.
Dr. Gruenstein holds board certification in three specialties: Medical Oncology, Hematology, and Internal Medicine. This triple certification reflects both his clinical breadth and his depth of training in cancer and blood disorders.
Dr. Gruenstein completed his subspecialty training at Beth Israel Hospital in New York. He subsequently joined the faculty at Mount Sinai School of Medicine, where he serves as Associate Clinical Professor of Medicine in Hematology and Medical Oncology.
Dr. Gruenstein serves as Associate Clinical Professor of Medicine at the Mount Sinai School of Medicine. He leads tumor boards and serves on hospital administrative boards at both Mount Sinai and Lenox Hill hospitals.
Yes, New York Magazine and Castle Connolly have both recognized Dr. Gruenstein among the Best Doctors in the US and New York. He has also earned Patients' Choice and Compassionate Doctor's Awards.
Dr. Gruenstein speaks Italian in addition to English, which can be helpful for Italian-speaking patients who prefer to discuss their care in their native language.
Dr. Gruenstein holds attending privileges at both Mount Sinai and Lenox Hill hospitals. This gives his patients access to two major New York City medical centers when inpatient or procedural care is needed.
Doctor profile last updated March 21, 2026