Dr. Jonathan L. Riegler is a gastroenterologist in Templeton, California and is affiliated with multiple hospitals in the area, including Twin Cities Community Hospital and French Hospital Medical Center. He received his medical degree from University of Michigan Medical School and has been in practice for more than 20 years. Dr. Jonathan L. Riegler has expertise in treating colonoscopy, upper gi endoscopy, inflammatory bowel disease (ibd), among other conditions - see all areas of expertise. Dr. Jonathan L. Riegler accepts Medicare, Aetna, Blue Cross - see other insurance plans accepted.