Reflux is a serious condition with the potential to affect quality of life and cause more serious conditions of the esophagus. Protecting the health of your GI system depends on the quality of your care, and the doctors at the Reflux Center are second to none. With training from top medical schools, our board-certified physicians participate in cutting-edge research and lecture around the world. They have also appeared on news programs and publications such as Discovery Health, The Oprah Winfrey Show, The Doctors, The New York Times, People, Entertainment Tonight, The Insider, CNN, ABC News, Fox 11 News, ELLE magazine and more.

To make an appointment with some of the best GI doctors in the country, please contact the Reflux Surgery Center of Excellence today at 888-712-2961.

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Medical Directors

mahtabifard-aliAli Mahtabifard, MD

Dr. Ali Mahtabifard is a director of the Reflux Surgery Center of Excellence. He is double board-certified in general and cardiothoracic surgery with extensive training in the treatment of acid reflux using the most state-of-the-art technologies. He also specializes in transoral incisionless fundoplication (TIF) using the EsophyX device for the treatment of reflux.

Dr. Mahtabifard’s research has been published in numerous peer-reviewed journals, including the Journal of Thoracic and Cardiovascular Surgery, Journal of Immunotherapy, Clinical Cancer Research, Molecular Therapy, Human Gene Therapy, Annals of Thoracic Surgery, and Thoracic Surgery Clinics. He has also presented at the American Association for Thoracic Surgery.

Dr. Mahtabifard received his Bachelor’s degree from the University of California, Berkeley and his medical degree from New York Medical College. He completed a general surgery internship at St. Vincent’s Hospital and Medical Center of New York and then completed his general surgery residency at the world-renowned Massachusetts General Hospital of Harvard University. Dr. Mahtabifard is renowned for his compassionate, expert care. He also has a private practice called West Coast Associates for Minimally Invasive Thoracic Surgery.

Dr. Mark DavidsonMark Davidson, MD

Mark Davidson, MD is a director of the Reflux Surgery Center of Excellence, and is board-certified in both Gastroenterology and Internal Medicine. Dr. Davidson is an Attending Physician at Cedars Sinai Medical Center and other local hospitals in Los Angeles, in addition to having his own gastroenterology practice. His practice focuses on clinical medicine and a variety of endoscopic procedures. Thousands of patients have trusted their medical care to Dr. Davidson for a variety of medical disorders but especially for screening of colon cancer.

Mark Davidson, M.D. received his medical degree from David Geffen School of Medicine at the University of California, Los Angeles (UCLA). He completed a three-year residency program in internal medicine at the UCLA-affiliated Veterans Affairs Medical Center in Los Angeles and finished a three-year fellowship program in Gastroenterology with emphasis on liver disorders at the UCLA-affiliated Kaiser Permanente Medical Center in Los Angeles.

Our Renowned Team of GI Doctors

Dr. Siamak TabibSiamak Tabib, MD

Siamak Tabib, MD is board-certified in Internal Medicine, Gastroenterolgy and Hepatology. Dr. Tabib incorporates both health maintenance and disease prevention in his practice of Gastroenterology and Hepatology. These two specialty fields of medicine deal primarily with conditions of the digestive tract. His goal is to maintain health primarily through disease prevention, and when necessary, to intervene with appropriate state of the art methods.

Dr. Payman Khorrami

Payman Khorrami, MD

Payman Khorrami, MD is board-certified in Gastroenterology and Hepatology and has had the additional education to diagnose and treat complex gastrointestinal problems. He has been expertly trained to perform colonoscopies when they are required to determine the cause of a patient’s complaints. Dr. Khorrami has appeared on several television and radio talk shows to discuss disorders of the gastrointestinal tract.

Dr. Arash Ari NowainArash Ari Nowain, MD

Arash Ari Nowain, MD, is board-certified in gastroenterology and internal medicine and specializes in medical disorders of the digestive system. Dr. Nowain treats acute and chronic GI problems with a heavy focus on prevention of colon cancer. Dr. Nowain has staff privileges at the Cedars-Sinai Medical Center and other local hospitals in Los Angeles, in addition to being the director of the Center for GI Health. He is a Los Angeles native and is thrilled to practice where he grew up.

Dr. Leo TreyzonLeo Treyzon, MD, MS

Leo Treyzon, MD, MS is a board-certified gastroenterologist and board-certified in clinical nutrition. Dr. Treyzon is the Chief of Gastroenterology at Cedars-Sinai in Los Angeles. He has a sub-specialization in nutrition and obesity. He also serves on the Cancer Committee at Cedars Sinai Medical Center and is an active member in four Centers of Excellence at Cedars Sinai: Weight Loss Center, Esophageal Disorders Center, the Colorectal Cancer Center, and the Inflammatory Bowel Disease Center.

Dr. Peyton BerookimPeyton Berookim, MD

Peyton Berookim, MD is board-certified by the American Board of Internal Medicine and Subspecialty Board of Gastroenterolgy. Dr. Berookim’s key areas of interest are colon cancer screening, surveillance, and prevention. As a member of the American College of Gastroenterology and the American College of Physicians, Dr. Berookim has placed special emphasis on continually educating himself on the latest and most advanced procedures and treatments in gastroenterology.

Dr. Maurice ElihuMaurice Elihu, MD

Dr. Maurice Elihu is a board-certified gastroenterologist that specializes in the comprehensive evaluation and prevention of colorectal cancers. He believes that the key to proper diagnosis and treatment is personal attention to every patient. Dr. Elihu is an active member of American College of Gastroenterology & Southern California Society of Gastroenterology as well as a Diplomate of the American Board of Internal Medicine and American Board of Gastroenterology.

Dr. Farshid Sam RahbarFarshid Sam Rahbar, MD

Farshid Sam Rahbar, MD is the leading integrative gastroenterologist in Los Angeles, California. He is board-certified in Gastroenterology, Internal Medicine, Integrative Holistic Medicine, and Anti-Aging, Regenerative, and Functional Medicine. Dr. Rahbar incorporates anti-aging & functional medicine for an integrative-holistic approach to digestive care. He brings over 20 years of excellent technical skills in endoscopy and colonoscopy along with a Holistic-Integrative approach to each.

Dr. Shabab MedizadehShahab Mehdizadeh, MD

Shahab Mehdizadeh, MD is board-certified in gastroenterology, internal medicine, and diseases of the liver. His research focuses on new and advanced endoscopic techniques with particular emphasis on prevention of cancers of the colon. Dr. Mehdizadeh greatly values the importance of nutrition in the treatment and prevention of disorders. He is board certified by the American Board of Physician Nutrition Specialists.

Benjamin-Basseri-MDBenjamin Basseri, MD

Benjamin Basseri, MD is a gastroenterologist who specializes in the evaluation and management of difficulty swallowing (dysphagia), indigestion (dyspepsia), abdominal pain, irritable bowel syndrome, inflammatory bowel disease, and colorectal cancer screening. Dr. Basseri is also an active member of the American Gastroenterological Association, American College of Gastroenterology, and American Society for Gastrointestinal Endoscopy.

clark-fuller-thoracic-surgeonClark B. Fuller, MD, Thoracic Surgery

Dr. Clark Fuller is board-certified by the American Board of Thoracic Surgery. He possesses extensive experience in minimally invasive thoracic surgery, with expertise in hyperhidrosis, lung cancer screening and therapy, esophageal cancer and motility disorders, disease of the thymus, aerodigestive tract stenting, and chest wall tumors. Dr. Fuller is also on staff at Cedars-Sinai Medical Center, serves as an adjunct faculty member at the John Wayne Cancer Institute, and directs the minimally invasive thoracic surgery center at St. John’s.

MakhaniMarc D. Makhani, MD

Dr. Marc D. Makhani is a gastroenterologist who is native of Los Angeles. Dr. Makhani centers his principles on a passion for promoting overall health and wellbeing. Dr. Makhani has a wide range of clinical and research interests that include colon cancer screening and prevention, motility disorders of the gastrointestinal tract, gastroesophageal reflux disease, peptic ulcer disease, irritable bowel syndrome and inflammatory bowel disease.


Marc Edelstein, MD, FACP, FACG

Dr. Edelstein earned his medical degree from Boston University. He is a board certified gastroenterologist and renowned expert at diagnosing and treating digestive disorders. He has completed a Gastroenterology fellowship at UCLA Medical Center.  He currently serves as a Diplomate of the American Boards of Internal Medicine and Gastroenterology.

Contact a Reflux Specialist in Los Angeles

Our doctors trained in top programs and specialize in the diagnosis and treatment of acid reflux. While the majority of our patients prefer to undergo their surgery at our outpatient surgery center, patients may also opt to have their procedure at Cedars Sinai Medical Center. If you would like to learn more information about Cedars Sinai reflux surgery options, or to schedule a consultation at our outpatient surgery center, call (888) 593-1042.

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