Dr. John Mark B. Gubatan is a gastroenterologist in Stanford, California and is affiliated with multiple hospitals in the area, including Stanford Health Care-Stanford Hospital and Lucile Packard Children's Hospital Stanford. He received his medical degree from Harvard Medical School and has been in practice between 11-20 years. Dr. John Mark B. Gubatan has expertise in treating colonoscopy, upper gi endoscopy, inflammatory bowel disease (ibd), among other conditions - see all areas of expertise. Dr. John Mark B. Gubatan accepts Medicare, Aetna, Blue Cross, United Healthcare - see other insurance plans accepted.