Issam A Oneyssi MD

Hospital Medicine/Hospitalist

Clinical Chief, Hospital Medicine/Internal Medicine, UMass Memorial Health Harrington Hospital

100 South StSouthbridge, MA 01550
Phone+1 508-765-9771
Fax+1 508-909-7735

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Summary

Issam Oneyssi, MD, is an internal medicine specialist based in Southbridge, MA, with a subspecialty in hospital medicine. He completed his residency in Internal Medicine at Mass General/Brigham and Women's - Faulkner Hospital from 1990 to 1994 after graduating from the American University of Beirut Faculty of Medicine in 1990. Dr. Oneyssi worked as a primary care physician for the Boston VA Healthcare system from 1994 to 2008. Since 2008, Dr. Oneyssi has worked as a full-time hospitalist, and he was appointed as Clinical Chief of Hospital Medicine at UMass Memorial Health - Harrington Hospital in December 2025. His publications include "Disseminated Erythema Migrans" in The American Journal of Medicine and "CREST presenting with cardiac tamponade" in Med Health R I.

Education & Training

Mass General Brigham/Brigham and Women's HospitalResidency, Internal Medicine, 1990 - 1994
American University of Beirut Faculty of MedicineClass of 1990

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Certifications & Licensure

MA State Medical License 1992 - 2027
American Board of Internal Medicine Internal Medicine

Publications & Presentations

PubMed

1 citations
Disseminated Erythema Migrans.
Ajay Kumar Mishra, Zeba Hashmath, Issam Oneyssi, Abhishek Bose
The American Journal of Medicine. 2020-02-13

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Doximity / States / Massachusetts / Southbridge / Issam Oneyssi, MD

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