Benjamin Basseri, MD

Dr. Benjamin Basseri is a board-certified gastroenterologist specializing in the diagnosis and treatment of digestive disorders. A Los Angeles native, Dr. Basseri earned his undergraduate degree in Neuroscience from UCLA, graduating summa cum laude, before completing his medical degree at the David Geffen School of Medicine at UCLA. He completed his Internal Medicine residency at Cedars-Sinai Medical Center and advanced fellowship training in Gastroenterology and Hepatology through UCLA. Dr. Basseri provides comprehensive gastrointestinal care with a focus on colon cancer screening, colonoscopy, upper endoscopy, abdominal pain, reflux, bowel disorders, and preventive digestive health. He is committed to offering thoughtful, evidence-based care while helping patients better understand their symptoms, treatment options, and long-term digestive wellness.

Best GI Doctor in Los Angeles & Beverly Hills GI Specialist 

Peyton Berookim, MD

Dr. Peyton Berookim is a board-certified gastroenterologist dedicated to providing comprehensive and patient-centered digestive care. He leads the Gastroenterology Institute of Southern California and has advanced training in the diagnosis, prevention, and treatment of gastrointestinal conditions. Dr. Berookim’s clinical interests include colon cancer prevention, colonoscopy, upper endoscopy, acid reflux, Barrett’s esophagus, inflammatory bowel disease, abdominal pain, and other digestive disorders. He is known for emphasizing early detection, minimally invasive procedures, and patient education throughout the care process. Dr. Berookim works closely with patients to create individualized treatment plans designed to improve digestive health, prevent disease, and support long-term wellness. His approach combines clinical expertise with a strong focus on comfort, communication, and high-quality care.

Best Gastroenterologist in Los Angeles | Gi Doctor | Dr. Peyton Berookim

Yosef Nasseri, MD

Dr. Yosef Nasseri is a double board-certified general and colorectal surgeon specializing in minimally invasive and robotic colorectal surgery. He is a founding partner of The Surgery Group of Los Angeles and serves patients throughout the Los Angeles and Beverly Hills area. Dr. Nasseri completed his General Surgery residency at Cedars-Sinai Medical Center and advanced fellowship training in Colon and Rectal Surgery at Cleveland Clinic Florida. His clinical expertise includes colorectal cancer, inflammatory bowel disease, diverticular disease, hemorrhoids, pilonidal disease, anorectal disorders, and other benign and malignant conditions of the colon and rectum. Dr. Nasseri focuses on advanced surgical techniques that support patient safety, comfort, and recovery while providing individualized care for each patient’s condition and treatment goals.

Colorectal Surgeon Los Angeles | Yosef Nasseri, MD, FACS, FASCRS

Arash Nowain, MD

Dr. Ari Nowain is a board-certified gastroenterologist who has been in private practice since 2008 and is widely regarded for his expertise in upper endoscopy (EGD) and colonoscopy. He earned his medical degree from the Keck School of Medicine of USC, where he also completed his residency in Internal Medicine and fellowship training in Gastroenterology. Having performed thousands of advanced endoscopic procedures throughout his career, he is committed to delivering exceptionally thorough, high-quality examinations with an emphasis on patient safety, comfort, and the early detection and prevention of gastrointestinal disease.

His practice focuses on comprehensive digestive health, including colorectal cancer screening and prevention, GERD, Barrett’s esophagus, abdominal pain, bowel disorders, liver disease, inflammatory bowel disease, and other complex gastrointestinal conditions. Through his concierge model, Dr. Nowain provides unrushed visits, direct physician access, and highly personalized care, combining the latest advances in gastroenterology with meticulous attention to each patient’s unique concerns and long-term health goals.

Beverly Hills Gastroenterologist | Center for GI Health

Jonathan Pourmorady, MD

Dr. Jonathan S. Pourmorady is a board-certified gastroenterologist and internist providing comprehensive digestive health care. He graduated summa cum laude from UCLA and earned his medical degree from the University of California, Irvine School of Medicine. Dr. Pourmorady completed his Internal Medicine residency at Cedars-Sinai Medical Center and fellowship training in Gastroenterology and Hepatology at Yale New Haven Hospital. His practice focuses on evidence-based care for a wide range of gastrointestinal and liver conditions, including colon cancer screening, reflux, abdominal pain, bowel disorders, liver disease, and preventive digestive health. Dr. Pourmorady emphasizes a holistic, patient-centered approach and works closely with each patient to develop a clear, individualized care plan that supports both immediate concerns and long-term wellness.

Participating Telehealth Provider | Jonathan S Pourmorady, MD

Leo Treyzon, MD, MS

Dr. Leo Treyzon is a board-certified gastroenterologist and clinical nutrition specialist serving patients in Los Angeles and the Westside community. He earned his medical degree from the University of California, San Diego, completed his Internal Medicine residency at Cedars-Sinai Medical Center, and completed fellowship training in Gastroenterology at UCLA. Dr. Treyzon has also served as Clinical Chief of the Karsh Division of Gastroenterology at Cedars-Sinai. His clinical interests include digestive disorders, nutrition, colon cancer screening, reflux, irritable bowel syndrome, inflammatory bowel disease, small intestinal bacterial overgrowth, ulcers, and preventive gastrointestinal care. Dr. Treyzon combines gastroenterology and nutrition expertise to help patients better understand their symptoms and develop personalized treatment strategies that support long-term digestive and overall health.

Dr. Leo Treyzon Gastroenterology | Leo Treyzon, MD

David Yamini, MD

Dr. David Yamini is a double board-certified physician in Internal Medicine and Gastroenterology specializing in disorders of the digestive system. His clinical focus includes conditions affecting the esophagus, stomach, small intestine, colon, liver, gallbladder, and pancreas. Dr. Yamini treats both acute and chronic gastrointestinal concerns, including inflammatory bowel disease, indigestion, small intestinal bacterial overgrowth, irritable bowel syndrome, reflux, abdominal pain, and liver-related conditions. He also emphasizes prevention and screening for serious digestive diseases, including colon, pancreatic, and esophageal cancer. Dr. Yamini is committed to providing thorough, compassionate care and helping patients understand their diagnosis, treatment options, and long-term digestive health needs through an individualized and preventive approach.

Santa Monica Gastroenterologist | Beverly Hills Liver Disease Treatment