Our Practice


1760 Termino Ave.
Suite 300
Long Beach, CA 90804
PH: (562) 933-3009
FX: (562) 933-8557

3640 Lomita Blvd.
Suite 102
Torrance, CA 90505
PH: (562) 933-6730
FX: (562) 933-6743

9940 Talbert Ave.
Suite 200
Fountain Valley, CA 92708
PH: (714) 378-7230
FX: (714) 378-7231

2021 Santa Monica Blvd.
Suite 325E
Santa Monica, CA 90404
PH: (310) 844-1194
FX: (310) 844-9166

Our Practice

The History of Children's Gastroenterology, MCSG
From the start, we have been dedicated to providing quality diagnosis and treatment to children experiencing both simple and complex gastrointestinal (GI) problems. Our doctors have over a combined 100 years of experience as Pediatric Gastroenterology specialists. Visit our Bio page for more complete biographical information about our physicians and staff.

Our Practice

Our Specialties Within Gastroenterology

Dr. Richard K. Mathis has a special interest in nutrition, abdominal pain, liver conditions, cystic fibrosis, and inflammatory bowel disease. He is a skilled pediatric endoscopist and trained in several other specialty diagnostic techniques relating to children's gastroenterology.

Dr. Sarah Sela's interests include liver disease, nutrition, inflammatory bowel disease and GI manifestations in Autism. As well as being a key physician with Children's Gastroenterology, MCSG, Dr. Sela helps UC Irvine Medical School students and residents learn the complexities of treating GI disorders.

Dr. Stephanie Abrams has a special interest in liver disease, fatty liver disease, childhood obesity, inflammatory bowel disease, chronic abdominal pain and the nutritional management and role of probiotics in the treatment of gastrointestinal conditions. Dr. Abrams brings numerous years of experience as a liver transplant specialist and a national obesity specialist and is building a Liver Center and Obesity Center.

Dr. Sonia Michail has a unique interest in understanding the role of the intestinal bacteria in children's health and disease. She is an expert in many aspects of gastrointestinal disease including inflammatory bowel disease and fecal transplant therapies. She is a recognized leader in the field and was named Best Doctor 2015 by LA Magazine.

Dr. Leon Chenís interests include gastro-esophageal reflux, inflammatory bowel disease, and liver disease including viral hepatitis. Dr. Chen is actively involved in the education of physicians in training and families in the community. A volunteer and speaker at numerous community events, he also is the founder of a respite program for children with chronic diseases.

Dr. Roy Nattiv has a unique interest in treating inflammatory bowel diseases including Crohnís and ulcerative colitis, irritable bowel syndrome, and chronic abdominal pain. Dr. Nattivís training in both clinical and basic scientific research has afforded him a unique perspective and knowledge of the most recent groundbreaking therapies. Dr. Nattiv was recruited to Childrenís Gastroenterology, MCSG as part of an effort to open an inflammatory bowel disease center of excellence.

Diagnostic Procedures

        Many diagnostic procedures are available on an outpatient basis with Children's Gastroenterology, MCSG.

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