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Dr. Steven Montana

Medical Oncology & Hematology

Steven Montana, DO is board certified in hematology and medical oncology. He has been a practicing medical hematologist and oncologist on Long Island, NY since 1998.

Dr. Montana received his Bachelor’s degree in Biology from Hofstra University in Hempstead, before attending The New York College of Osteopathic Medicine in Old Westbury, NY where he received his D.O. During this time, he also completed a rotating internship at Saint Clare’s Hospital and Medical Center. Following his internship, Dr. Montana completed his Internal Medical Residency at Saint Vincent’s Hospital and Medical Center and then continued to Stony Brook University for his fellowship where he participated in basic science cancer research studies.

Since then, Dr. Montana has been the co-author of several medical publications. Dr. Montana treats patients at our Port Jefferson and Smithtown offices. Many of his special areas of interest include gastrointestinal cancers, lung cancer, lymphoma, and malignant/nonmalignant hematology.

Credentials:  DO
Education & Training
   FACP:    State University of New York at Stony Brook
    Residency:    St. Vincent's Hospital and Medical Center
    Medical School:    New York College of Osteopathic Medicine
    College:    Hofstra University


John T Mather Memorial Hospital
Peconic Bay Medical Center
Southside Hospital
St. Catherine Of Siena Medical Center
St. Charles Hospital

Patient Reviews

  • "Dr Montana is wonderful always listens to you and ready to help you however he can the staff is so kind and helpful"
      from Sharon 5.0 Stars - (2025-06-20)
  • "Great staff. Caring and very attentive to your needs. Have been a patient there for many years and I have never had one issue. Dr. Decosta and his Aid of fabulous and caring. Thank you for your service."
      from Keith 5.0 Stars - (2025-06-19)
  • "Everyone was so professional and so helpful. Made me feel very comfortable."
      from karen 5.0 Stars - (2025-06-15)
  • "Amazing staff always ready to help you with any problem you have. Dr Montana is an incredible doctor. We always leave knowing exactly what's happening. Never rushes you and talks to you like family. I would highly recommend Dr. Montana and his office"
      from dawn 5.0 Stars - (2025-06-06)
  • "Very professional."
      from Lee 5.0 Stars - (2025-06-01)
  • "I have been under Dr. Montana’s care for almost 25 years and I cannot speak highly enough of Dr. Montana and the exceptional care he provides. As a patient, finding a physician who is not only a brilliant medical expert but also truly compassionate and attentive is rare—and Dr. Montana exemplifies both qualities in every possible way. From the moment you walk into his office, it’s clear that you are in the hands of someone who is not only deeply knowledgeable but also genuinely invested in your well-being. Dr. Montana takes the time to listen carefully, explain complex medical information with clarity and patience, and ensures that every concern is addressed. He never rushes appointments and always makes you feel like your health is his top priority. What truly sets Dr. Montana apart is his extraordinary combination of clinical excellence and human warmth. His sensitivity to the emotional aspects of care—especially when navigating difficult or uncertain diagnoses—is nothing short of remarkable. He speaks with honesty, but always with empathy, kindness, and a calm reassurance that brings real comfort during challenging times. In addition to his outstanding bedside manner, Dr. Montana is a recognized leader in the field of hematology. His expertise is matched by his ongoing commitment to research, education, and innovation. It’s incredibly reassuring to know that you’re being guided by someone so well-respected by colleagues and deeply dedicated to advancing care for patients. I feel incredibly fortunate to be under Dr. Montana’s care. He is a rare and extraordinary physician—thorough, kind, sensitive, and a true expert in his field. I would recommend him without hesitation to anyone seeking compassionate, top-tier hematologic care."
      from Michelle 5.0 Stars - (2025-05-29)
  • "he’s been very Informative and he has helped me quite a bit especially when I had my infusion done for my iron low blood. I’ve been feeling great wonderful doctor and wonderful PAs"
      from John 5.0 Stars - (2025-05-24)
  • "A beautiful welcoming calming facility with an amazing staff! I went there to get blood tests and a consult with a hematologist and naturally was very nervous. The staff made me feel very comfortable and kept me calm with their professionalism and patience. Loved Dr. Montana !"
      from Pam 5.0 Stars - (2025-05-22)
  • "Finally a doctor that's going to help me! I've been sick so long and got no answers for years. He knew right away how much I've suffered and what it can be! I'm so very thankful I found him! Absolutely greatful for this doctor because I had lost hope in finding out what exactly I've been battling! I had no hope and he was the last stop because I exhausted several types of doctors with no results, just more questions. Thank you Doctor Montana! My family and I are beyond greatful to you!"
      from Danielle 5.0 Stars - (2025-05-22)
  • "Dr & staff amazing with all question staff taking our blood also amazing. But love Dr Montana I wish could have him as my pCP"
      from Louis 5.0 Stars - (2025-05-22)