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

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


Patient Reviews

  • "Treated wonderfully by all. Loved my experience."
      from Theresa 5.0 Stars - (2024-02-21)
  • "The staff is very professional and friendly. The only thing that concerns me is after my visit and need you make another appointment I shouldn't have to wait on a long line of people that just came in to make another appointment after being there an hour and a half"
      from frank 5.0 Stars - (2024-02-20)
  • "Everyone at this facility is beyond caring, comforting,& attentive. Staff is fantastic and always accomodating. Thank you all for making the visits "that much easier" ❤️"
      from Melissa 5.0 Stars - (2024-02-20)
  • "The Riverhead facility is so professional and welcoming as well. , I have had many phlebotomies since I was diagnosed years ago and nothing compares to the care and impeccable treatment I have received here. The place is luminous and immaculate.The nurses are skilled and friendly, there is absolutely no discomfort during the treatment and the environment generates relaxation and well being .Also Dr Avvento’s P.A has always been present, attentive, very clear in her explanations and a keen listener. I really feel I am in the best of hands every time I enter this facility, Many thanks."
      from myriam 5.0 Stars - (2024-01-21)
  • "Thank you Dr Avvento and team for getting me in right direction in dealing with my pneumonia. A recap of my experience follows: 1) my PET scan showed I had congestion on my chest and NYC&B notified me. 2) Condition seemed to be under control but a visit at Hampton Medical resulted in chest X-rays indicating pneumonia. 3) Hampton Medical prescribed Cefdinir 300mg but even after 2nd script my condition worsened. 4) The NYC&B team recommended I see Dr A and his NP. They prescribed Levaquin750 for a week and finally after an additional 3 pill dose my condition improved. Hooray for Dr A and his team. I realize that treating pneumonia is not in your normal job discription but I fully appreciate you and your team’s effort. Henry Glynn"
      from Henry 5.0 Stars - (2024-01-18)
  • "Dr went above and beyond to answer my questions about medications"
      from Virginia 5.0 Stars - (2024-01-10)
  • "From the moment I entered the medical building everything was professional and yet personal. Dr Avvento is absolutely the best doctor and so knowledgeable."
      from Joan 5.0 Stars - (2023-12-30)
  • "Every employee we dealt with was amazing. Thank you for making us feel so comfortable."
      from thomas 5.0 Stars - (2023-12-29)
  • "Wonderful people; long waits"
      from Barbara 4.0 Stars - (2023-12-27)
  • "I arrived on time for my appointment and was called right away and shortly after I met with Dr Dr Avento"
      from Charlie 5.0 Stars - (2023-12-13)