Dr Jonathan Koh is an Associate Consultant in the Department of Gastroenterology and Hepatology in Tan Tock Seng Hospital. His clinical practice spans a wide spectrum of digestive and liver conditions, with particular interest in Inflammatory Bowel Disease (IBD). He manages common gastrointestinal conditions such as abdominal pain and bloating, reflux, and colorectal cancer screening, and performs routine gastroscopy and colonoscopy.

Dr Koh completed his medical degree in the Yong Loo Lin School of Medicine, National University of Singapore, in 2017, and attained his Membership of the Royal College of Physicians, United Kingdom, and Master of Medicine in Internal Medicine from the National University of Singapore in 2022. He completed his Internal Medicine Residency training in SingHealth and was appointed Deputy Chief Resident in 2022, and was awarded the SingHealth Best Junior Doctors' Award in 2023. He subsequently embarked on his Senior Residency training in the Gastroenterology Residency Programme in NHG Health and served as its Chief Resident in 2025. He obtained the European Speciality Examination in Gastroenterology and Hepatology in 2025, and completed the Gastroenterology Residency Programme, receiving his specialist accreditation in July 2026.

In addition to his clinical work, Dr Koh is actively involved in research and has presented at various international conferences. He has contributed to several publications in the fields of small bowel endoscopy, large language models, and artificial intelligence.

Dr Koh is actively involved in medical education, serving as a Core Clinical Tutor at the Lee Kong Chian School of Medicine and the Yong Loo Lin School of Medicine. He is also an Education Associate with the SingHealth Duke-NUS Medicine Academic Clinical Programme.

Dr Koh is a member of several professional societies, including the Singapore Medical Association, the Gastroenterological Society of Singapore, and the European Crohn's and Colitis Organisation.