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

  • "Everyone at the Riverhead office is wonderful. I would especially like to recognize Hannah at the front desk. She is always so pleasant and helpful. I also would like to recognize Nanette the RN who gives me my monthly chemo shot. She seems to be the only one that can give me the shot correctly with no pain as I have had several who could not nor knew how to inject it. Thank you Hannah and Nanette you both are definite assets to NY Cancer and Blood."
      from Violet 5.0 Stars - (2024-11-20)
  • "Very detail oriented, did not rush you out of the office, he made sure he didn’t miss a beat very friendly and customer was to a T👏👏👏👏"
      from Christiana 5.0 Stars - (2024-11-18)
  • "All went well. Nice staff.Dr.Avvento is a genius!"
      from kathleen 5.0 Stars - (2024-11-15)
  • "Everybody was helpful, knowledgeable and kind. Very thorough."
      from Barbara 5.0 Stars - (2024-11-06)
  • "NY Blood and Cancer is a great place for your medical needs. Dr. Avvento and his staff are welcoming and make sure all you needs and questions are answered."
      from Jason 5.0 Stars - (2024-10-29)
  • "I had received some scary results from an MRI that another Doctor had ordered for me and wasn’t scheduled to see Dr Avvento for a routine follow up for a couple of weeks. I was a nervous wreck. The staff was very accommodating and moved my appt up. When I arrived at the office there was a mix up but the nursing staff spoke to Dr Avvento and he said of course he would see me. He reviewed all my scans with me and alleviated my fears. Dr Avvento is truly the most caring and knowledgeable Doctor I have ever worked with. I trust him with my life."
      from Sandra 5.0 Stars - (2024-10-18)
  • "Wait time was very minimal. Support staff were very friendly. Center itself was very clean. Physicians assistant was very informative. I asked questions and she answered them in a manner which I could understand."
      from Thomas 5.0 Stars - (2024-10-01)
  • "Dr. Avvento and his staff are all genuinely caring people. I’ve been a patient since 2015 and am so glad that I’ve been treated here."
      from Gerri 5.0 Stars - (2024-09-24)
  • "Professional, thorough, trustworthy. I have complete faith in Dr. Avvento"
      from Rosalie 5.0 Stars - (2024-09-19)
  • "I had a very pleasant visit with the NP. Shannon is intelligent , caring, patient and very easy to talk to about what’s going on. The entire staff exemplifies Dr Avvento’s character- kind, calm, intelligent, and always willing to help ."
      from Daryn 5.0 Stars - (2024-08-31)