Dr. Razi M. Arifuddin

Eric Chak is a Gastroenterologist in Davis, California. Dr. Chak is rated as a Distinguished provider by MediFind in the treatment of Nonalcoholic Steatohepatitis (NASH). His top areas of expertise are Hepatitis, Alcoholic Cirrhosis, Jaundice, Visceromegaly, and Endoscopy. Dr. Chak is currently accepting new patients.

Sam Zamani is a Gastroenterologist in Walnut Creek, California. Dr. Zamani is rated as a Distinguished provider by MediFind in the treatment of Nonalcoholic Steatohepatitis (NASH). His top areas of expertise are Diverticular Disease, Berdon Syndrome, Gastroesophageal Reflux Disease (GERD), and Anal Fissure.

Dr. Mark M. Tsuchiyose is a board-certified gastroenterologist with over 35 years of experience treating complex gastrointestinal and liver disorders. He provides personalized, patient-centered care and performs advanced diagnostic and therapeutic endoscopy with a strong emphasis on safety, comfort, and long-term outcomes. His approach blends clinical precision with a deep commitment to understanding each patient’s full health picture.Expanded his clinical model through formal training in functional and holistic medicine since 2014, focusing on root causes of chronic disease.Developed targeted nutritional strategies to support pyloric valve function and help patients reduce bile-related injury and discontinue long-term PPI therapy safely.At CDCH, improves liver health, reducing liver fat in nearly 90% of patients through metabolic and nutrition-focused interventions.Advocates for physician support, community health, and public wellness while helping patients transition away from unnecessary long-term acid suppression.Committed to compassionate, whole-person care. Dr. Tsuchiyose is rated as an Advanced provider by MediFind in the treatment of Nonalcoholic Steatohepatitis (NASH). His top areas of expertise are Exocrine Pancreatic Insufficiency, Angiodysplasia of the Colon, Indigestion, Gastrectomy, and Endoscopy.