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Dr. Dennis Koh

Senior Consultant General Surgery (Colorectal)


  • Colorectal Surgery
  • Endoscopy

Medical Conditions Treated:

  • Numerous colon and rectal conditions that require surgery, both open and minimally invasive, using a variety of surgical techniques including laparoscopic (keyhole), single port surgery, robotic surgery, and transanal endoscopic operation (TEO)
  • Pelvic floor disorders, including conditions like haemorrhoids (piles), anal fistula, anal fissures, anal abscesses, functional constipation, and faecal incontinence


English, Mandarin, Hokkien, Teochew, Cantonese, Bahasa Indonesia


B.Med Sci (UK), MBBS (UK), MMed (Surgery) (Singapore), FRCS (Edinburgh), FAMS (Gen Surgery) (Singapore)

Professional Profile:

Dr Dennis Koh is a highly qualified general surgeon with specialized training in colorectal surgery. He is the Medical Director and Senior Consultant Surgeon at Colorectal Practice. Dr Koh’s expertise lies in both open and minimally invasive colon and rectal surgeries, where he tailors each surgery to meet the unique needs and situation of the patient.

Aside from his proficiency in colorectal surgery, Dr Koh is also skilled in endoscopy procedures such as colonoscopy and gastroscopy. He has performed over ten thousand endoscopic procedures to date, including endoscopic stenting and endoscopic mucosal resection (EMR).

Dr Koh has a keen interest in proctology and pelvic floor disorders, such as haemorrhoids, anal fistula, anal fissures, anal abscesses, functional constipation, and faecal incontinence. He has honed his skills in these areas during his fellowship training in Geneva.

In addition to his clinical practice, Dr Koh is committed to training future surgeons. He has held teaching appointments at various institutions, including Duke-NUS Graduate Medical School and Yong Loo Lin School of Medicine, National University of Singapore. As a core faculty member of the SingHealth General Surgery Residency Program, he was actively involved in teaching and training surgical residents and medical students.