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

  • "Dr. Avvento is the best!!"
      from Rena 5.0 Stars - (2024-07-13)
  • "Best visit yet took me on time had a short wait that never happened before and along satisfying visit with the doctor they have increased staff and it makes for a much better experience"
      from Carolyn 5.0 Stars - (2024-07-11)
  • "The staff was very pleasant and attentive to my concerns. Dr Avento spent the time to explain my condition in detail and explained the importance of the type of treatment he recommended. Based on our conversation I feel confident in proceeding with his recommendation and look forward to beginning treatment."
      from Anthony 5.0 Stars - (2024-07-10)
  • "Dr. Avvento waskind compassionate & understanding. Explained what the bad effects could be instead of just giving me the rosy picture."
      from Cathy 5.0 Stars - (2024-07-09)
  • "A checkup & urine test for a UTI."
      from Joyce 5.0 Stars - (2024-06-26)
  • "Excellent facility, Couldn’t ask for nicer staff, especially Dr Avvento himself, he is a sweetheart, The building is spotless and such a nice atmosphere inside (Southhampton office) Riverhead office is a disaster all round staff,building etc"
      from Ashleigh 5.0 Stars - (2024-06-21)
  • "I could not find any medical care of a higher standard! Dr Avvento is the best hematologist anywhere!"
      from Mary 5.0 Stars - (2024-06-20)
  • "Dr Avvento and his staff were great. Dr Avvento was able to answer our questions and set me up for treatment. I was there with my wife and daughter and they both like Dr Avvento and staff."
      from Eriberto 5.0 Stars - (2024-06-20)
  • "Blood work service, wait for Doctor took an hour"
      from Francis 4.0 Stars - (2024-06-12)
  • "Excellent as always"
      from Monroe 5.0 Stars - (2024-06-06)