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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:  MD
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 and his team in Riverhead are the best. They take the time to talk to you about your concerns and take your comments seriously and make sure you are comfortable and given the very best care! Front desk is run professionally and efficiently."
      from Joanna 5.0 Stars - (2025-09-23)
  • "So far they’re great. Fast. Informative and honest. Very police and professional."
      from Steven 5.0 Stars - (2025-09-19)
  • "Fantastic, except for the insanely busy traffic you have to cross to get into the parking lot. It’s extremely dangerous."
      from brian 5.0 Stars - (2025-09-11)
  • "Would like to thank all the Dr adventures and staff for treatment of my hand after CT. Ha d is getting better. Also sending than to infusion staff."
      from Sharon 5.0 Stars - (2025-09-10)
  • "I can't say enough about how wonderful Dr. Avvento and his staff are with all their patients. Personally I feel as though my health is in the best of hands with NY Blood & Cancer."
      from charles 5.0 Stars - (2025-09-10)
  • "Everyone is kind, caring and knowledgeable. I feel recognized and I know they have my best interests."
      from Michelle 5.0 Stars - (2025-09-09)
  • "I saw Melanie, a nurse practitioner . She was wonderful I wish I could see her whenever I have an appointment. She really cared about my health. When she entered the room I felt comfortable with her right away."
      from Irene 5.0 Stars - (2025-08-19)
  • "thank you"
      from Pricila 5.0 Stars - (2025-07-31)
  • "All went very smoothly which was helpful as my appointment was one of several yesterday."
      from Glorya 5.0 Stars - (2025-06-06)
  • "I couldn’t be more appreciative. Dr. Avvento is an amazing man and doctor…. and the staff is professional, competent and pleasant!"
      from Linda 5.0 Stars - (2025-06-06)