Wei Fang Ko, MD, PhD
Practice: Unio Specialty Care
Specialty: Gastroenterology
Office locations: Castro Valley, Glendora, Hayward
Dr. Wei Fang Ko, M.D., Ph.D., earned his medical degree at Taipei Medical University, completed his internal medicine residency at the University of Minnesota, and completed his gastroenterology fellowship at UCSF. Board-certified by the ABIM in gastroenterology with over 20 years of clinical experience, he offers comprehensive digestive health care. He specializes in advanced endoscopic interventions, colonoscopy, upper GI endoscopy, and complex GI disorders.
Dr. Wei Fang Ko, M.D., Ph.D., earned his medical degree at Taipei Medical University, completed his internal medicine residency at the University of Minnesota, and completed his gastroenterology fellowship at UCSF. Board-certified by the ABIM in gastroenterology with over 20 years of clinical experience, he offers comprehensive digestive health care. He specializes in advanced endoscopic interventions, colonoscopy, upper GI endoscopy, and complex GI disorders.
GI-Glendora
Suite 200
Glendora, CA 91741
GI-Castro Valley
Suite 104
Castro Valley, CA 94546
GI-Hayward
Suite 212
Hayward, CA 94545
Dr. Wei Fang Ko, M.D., Ph.D., is a board-certified gastroenterologist with more than 20 years of experience providing comprehensive digestive healthcare. Based in Castro Valley, California, he specializes in advanced endoscopic interventions and has expertise in colonoscopy, upper GI endoscopy, and the diagnosis and treatment of a wide range of gastrointestinal conditions.
Dr. Ko earned his medical degree from Taipei Medical University, completed his residency in Internal Medicine at the University of Minnesota, and went on to complete a fellowship in Gastroenterology at the University of California, San Francisco (UCSF). He is affiliated with Eden Medical Center, St. Rose Hospital, and Bay Area Endoscopy Center–Castro Valley.
In addition to his clinical practice, Dr. Ko has contributed to the field of gastroenterology through publications in leading peer-reviewed journals, including The American Journal of Gastroenterology and Gastroenterology.
Education & Training
Taipei Medical University Medical School
University of California (San Francisco) Fellowship, Gastroenterology, 1997-2000
University of Minnesota Residency, Internal Medicine, 1994-1997

Very informative and when I asked my questions, he listened closely and gave me the information I needed to know excellent doctor
He is very thorough and answers all my questions.
Very nice.
Dr. Ko listens and explains things. Very happy to have him as my doctor.