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."
| Riverhead Medical Oncology | 750 Old Country Road, Riverhead, NY 11901 | 631-751-3000 |
| Southampton Medical Oncology | 640 County Road 39, Southampton, NY 11968 | 631-751-3000 |
| Eastern Long Island Hospital |
| Peconic Bay Medical Center |
| Southampton Hospital |
| Stony Brook University Hospital |
Patient Reviews
-
"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) -
"High quality care, expert administration, very sensitive support."
from Philip 5.0 Stars - (2025-05-24) -
"Dr. Avvento was very kind & thorough in answering my questions & concerns."
from Gayle 5.0 Stars - (2025-05-20) -
"Doctor Avvento is compassionate, professional and really listens to his patients and addresses their concerns. He inspires confidence and creates an atmosphere of healing."
from Virginia 5.0 Stars - (2025-05-09) -
"I had an excellent experience with Dr Avvento and his assistant Janie!"
from Joseph 5.0 Stars - (2025-05-08) -
"Everyone was caring, showed concern and I received expert care."
from Kristian 5.0 Stars - (2025-05-06) -
"Good"
from William 5.0 Stars - (2025-05-02)