Dr Ryan (Chang-Ho) Choi is a Consultant Gastroenterologist and Hepatologist based in South Sydney, providing specialist care for a wide range of digestive and liver conditions. He has a particular focus on inflammatory bowel disease (IBD). He holds appointments at leading hospitals across Southern Sydney, including St. George (public & private) Hospital, Waratah Private Hospital for both consultations and endoscopic procedures.
MBBS
Bachelor of Medicine
Bachelor of Surgery
FRACP
Fellow of RACP
PhD
Inflammatory Bowel Disease
and Colorectal Cancer
View Dr Choi's Credentials & Resume
Dr Choi completed his specialist training at internationally renowned centres, including St Mark's Hospital in London and St George Hospital in Sydney, and undertook a dedicated IBD fellowship at Concord Hospital, a national centre of excellence in IBD care.
His PhD research focused on colorectal cancer and inflammatory bowel disease, and his work has been published in leading international journals, including Nature Reviews Gastroenterology & Hepatology and Gut. He has presented at major international conferences, and his contributions have been recognised with multiple awards, including the European Crohn's and Colitis Organisation (ECCO) Y-ECCO Prize.
View Dr Choi's Academic & Clinical Awards
one of the leading international meetings in inflammatory bowel disease.
Dr Choi is known for his calm, patient-centred approach. He takes the time to listen carefully, explain conditions clearly, and work collaboratively with each patient to develop tailored management plans — ensuring patients feel informed, supported, and confident in their care.
Beyond clinical practice, Dr Choi shares clear, evidence-based information on gut health through his YouTube channel, empowering patients with trustworthy knowledge to better understand and manage their conditions.
He is fluent in both English and Korean, allowing him to communicate effectively with a diverse range of patients and their families.