Billy Chien-Hua Zhang, MD

Dr. Billy Zhang is an internal medicine physician who earned his medical degree from the University of Medicine and Health Sciences in St. Kitts. With nine years of experience in internal medicine, he provides comprehensive primary care for adult patients. Dr. Zhang speaks English and focuses on helping patients manage complex health conditions through evidence-based treatment approaches.

Dr. Zhang practices at St. Joseph Heritage Medical Group in Irvine, California. He specializes in treating obesity and weight management concerns, helping patients develop sustainable approaches to healthy living. Zhang also manages high cholesterol in children and teens, working with young patients and families to establish heart-healthy habits early in life. His expertise extends to hypertension care, where he helps patients control blood pressure through lifestyle modifications and medical management.