Headshot of Dr. Louis Avvento M.D.
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Languages: English, Italian

Dr. Louis Avvento

Medical Oncology & Hematology

Louis J. Avvento, MD graduated from the University of Rome with a degree in medicine in 1981. He continued with his residency at Jamaica Hospital in Queens, where he chose to submerge himself into the oncology world because, at the time, treatments were limited and patient care was extremely challenging. He wanted to be a part of a healthcare revolution to change the lives of oncology patients for the better and has found it to be the most rewarding career he could have chosen

After completing his fellowship in Hematology and Oncology at Stony Brook University, Dr. Avvento began a private practice in Riverhead as a solo practitioner with a nurse and receptionist – a staff of three. The practice eventually grew to a staff of forty-five oncology professionals. Dr. Avvento chose the East End of Long Island because in 1988, there were no other practices around. He created a more convenient and comfortable situation for patients.

Dr. Avvento is board-certified in four specialties including Internal Medicine, Hematology and Hospice, Medical Oncology, and Palliative Care. He has been the Medical Director of East End Hospice in Westhampton, NY since 1990. He is the former Director of Palliative Care at both Peconic Bay Medical Center and Southampton Hospital in Riverhead, NY. He was involved in establishing the Palliative Care Fellowship at Southampton Hospital for training doctors in palliative care. Dr Avvento was also responsible for the palliative care board certification of 4 physicians at the Southampton Hospital and 3 Nurse practitioners at Peconic Bay Medical Center under the newly established palliative care programs. Dr. Avvento is a former board member of Fighting Chance and currently holds an appointment as Adjunct Assistant Clinical Professorship at Mount Sinai.

Through the years, Dr. Avvento has received multiple awards in recognition of his outstanding performance and achievements in the field. Accolades include: “Best Doctors on Long Island’ –Newsday, 2008-2019; “Physician of the Year” –Peconic Bay Medical Center, 2005; “Best Doctors” –New York Magazine, 2004/2008; Castle Connolly Top Doctors: New York Metro Area – 2002 to 2008, 2010 to 2014; Patient’ Choice 5th Anniversary Award – 2012; Patients’ Choice Award – 2008 to 2012, 2014; and Compassionate Doctor Recognition – 2010 to 2012."

Credentials:  M.D.
Education & Training
   FACP:    State University of New York at Stony Brook, North Port VA Medical Center
    Residency:    The Jamaica Hospital
    Medical School:    University of Rome
    College:    New York University


Eastern Long Island Hospital
Peconic Bay Medical Center
Southampton Hospital
Stony Brook University Hospital

Patient Reviews

  • "It’s kind of scary to show up for an exam that might be linked to cancer. The office is well run and everyone was very nice. Doc. You were great as was your asst. Melanie"
      from Joseph 4.0 Stars - (2025-03-05)
  • "Jenna was terrific. We thoroughly discussed my test results and concerns."
      from Boris 5.0 Stars - (2025-03-04)
  • "Dr Avvento is the best. He's always looking for the best treatments he can find for the individual. He has been my guy for 19 years and I consider him a good friend too. He's kept my brother in law alive for almost 20 years with a type of cancer that is hard to fight."
      from Don 5.0 Stars - (2025-02-26)
  • "Very professional. Always taken well care of, from the lab techs, nurses, nurse practioner& doctors"
      from Kimbal 5.0 Stars - (2025-02-19)
  • "Dr Avento is simply the best. Knowledgeable, compassionate and up on the latest treatments. He saved my life and I am so grateful."
      from Julie 5.0 Stars - (2025-01-07)
  • "Dr. Avvento was such a pleasure to see. He is very knowledgeable and thorough while being kind and compassionate."
      from Suzann 5.0 Stars - (2024-12-31)
  • "Dr Avvento knows my case hands down & I am confident he will always do the very best he can to keep me healthy."
      from Byron 5.0 Stars - (2024-12-19)
  • "This is a very well managed practice. Kind and efficient from check in, to lab test and to doctor interview and diagnosis. Highly recommend."
      from Paul 5.0 Stars - (2024-12-14)
  • "Dr Avvento is knowledgeable and always knows what’s best for my super rare kidney disease."
      from Joseph 5.0 Stars - (2024-12-03)
  • "Such an amazing, caring and empathetic staff. I had my first treatment yesterday and was nervous - the nurses and staff could not have been kinder."
      from Jean 5.0 Stars - (2024-11-28)