Greater Houston Gastroenterology

Dr. Keith H. Fiman, Dr. Robert E. Davis, Dr. J. Guillermo Trabanino

Robert E. Davis, MD, Keith H. Fiman, MD, J. Guillermo Trabanino, MD, Kumara Peddamatham, MD, Nitesh Vachhani, MD, and Charles Phan, MD

Together, Dr. Robert E. Davis, Dr. Keith H. Fiman, Dr. J. Guillermo Trabanino, Dr. Kumara Peddamatham, Dr. Nitesh Vachhani, and Dr. Charles Phan form Greater Houston Gastroenterology in their Sugar Land offices. Greater Houston Gastroenterology is the largest full-service gastroenterology group in the Houston metro. This network of highly skilled physicians works together in the diagnosis, treatment, and care of people with gastrointestinal symptoms and diseases in their Sugar Land offices. A gastroenterologist is a highly trained physician who treats all aspects of the digestive system, including the esophagus, stomach, small intestine, large intestine, rectum, liver and gallbladder, and pancreas. As these organs work together in a healthy body, they are easy to ignore. A properly functioning digestive tract, after all, is easy to take for granted. Yet when problems arise due to diet, obesity, smoking, cancer, and disease, choosing the right gastroenterologist is one of the most important decisions you can make.

Why see a Specialist?

Many people who suffer from problems with their digestive system suffer in silence, often waiting until the symptoms are unbearable before seeking a physician’s help. These sufferers believe that they’re alone in their discomfort and trouble, and blame the pain and dysfunction on old age or other factors rather than seeking the help they need. Millions of people suffer each year from some form of digestive disorder, from diverticulitis to liver disease to acid reflux.

The good news is that you don’t have to suffer alone. Treatments are available, and the right gastroenterologist can help bring together your causes of discomfort with your symptoms in order to choose the best treatment plan for you going forward.

Board certified in gastroenterology, Drs. Davis, Fiman, Trabanino, Peddamatham, Vachhani, and Phan have the training and experience that you need.

Treatments Mean Results, Results Mean a Healthier You!

The most common problems of the GI tract, thankfully, are also the most treatable. Chest pain brought on by acid reflux, gallstones, celiac disease, Crohn’s disease, ulcerative colitis, and irritable bowel syndrome (IBS) are manageable with a proper diet, changes in lifestyle, and medication. More serious conditions like hemorrhoids or colonic polyps can be treated with surgeries that correct or remove the problem completely. Other conditions, like cancers of the pancreas, liver, stomach, or colon require the long-term attention and care of the right physician to help you learn and make educated decisions about the treatment or surgeries ahead. The key is early diagnosis and treatment. Don’t delay in finding the right doctor to help you find your way back to a healthier, happier lifestyle.

Suffering From Hepatitis? We Have the Experts for You!

The study of the liver, gallbladder, biliary tree, and pancreas—and their disorders—is called hepatology. Hepatology is generally considered to be a subset of gastroenterology. Billions of people have been infected with hepatitis B at some time in their lives, and many become persistent carriers able to spread the disease to others. The hepatitis B and hepatitis C viruses can be attributed as the cause of up to 80 percent of liver cancers.

Meet the Doctors

Robert E. Davis, MD, FACG, FACP, AGAF

Dr. Davis is a liver specialist. He volunteered for the Air Force during the Vietnam conflict and as a Medical Officer was assigned to duty in the Tactical Air Command Base at Bergstrom Air Force Base. Following that duty, he accepted a Gastroenterology Fellowship at Baylor College of Medicine in the Medical Center in Houston. Dr. Davis has remained on the Baylor College of Medicine faculty throughout his career. Since 1977, Dr. Davis has contributed his time at Ben Taub Hospital in the teaching of the Fellows in Gastroenterology at Baylor since 1979.

Keith H. Fiman, MD, FACG

Dr. Fiman specializes in the care of gastrointestinal disease in adults and adolescents. He attended medical school at Boston University, graduating with honors in 1986. He then completed his internship, Internal Medicine residency, and three-year Gastroenterology fellowship at the University of Texas Southwestern Medical Center in Dallas. Spending three years as a physician in the United States Navy, he has been in private practice since 1995. He also teaches endoscopy and colonoscopy at Ben Taub Hospital and is the President of Greater Houston Gastroenterology.

Julio Guillermo Trabanino, MD, FACG

Dr. Trabanino, a native Spanish-speaker, graduated medical school at the Universidad Nacional de El Salvador in 1971, served as an intern in 1972 and 1973 at the University of Rochester’s Genesee and Strong Memorial Hospitals in New York, and completed his residency at Genesee Hospital as Chief Resident from 1973 to 1975. Following his residency, he was awarded a fellowship for gastroenterology at Baylor College of Medicine in Houston, where he has taught as Clinical Assistant Professor of Medicine for family practice and community medicine from 1980 to the present.

Kumara Peddamatham, MD

Dr. Peddamatham’s personal philosophy is to provide the most ethical and efficient service possible for his patients. An Indian native, he received his medical degree in India before completing his internship and residency in general surgery/internal medicine at Cabrini Medical Center in New York City in 1978. He is double board certified in Internal Medicine and in Gastroenterology, and has been in private practice since 1983. He is currently on active staff at Methodist Sugar Land Hospital, Memorial Hermann Sugar Land Hospital, and CHI St. Luke’s Sugar Land Hospital.

Nitesh Vachhani, MD

Dr. Vachhani has special interests in liver disease and inflammatory bowel disease. He is a board certified gastroenterologist and a board certified internist who has been practicing in Richmond, Rosenberg, and Sugar Land since 2009. After completing medical school in San Antonio, he did his Internal Medicine training at Baylor College of Medicine and then did a three-year fellowship in Gastroenterology at the University of New Mexico.

Dr. Charles Phan

Charles Phan, MD

Dr. Phan is a native of Vietnam and specializes in liver diseases, especially viral hepatitis. He is affiliated with Methodist Hospital of Sugar Land and Memorial Hermann Sugar Land. After his residency in internal medicine, he also completed a gastroenterology fellowship at the University of California, Irvine in 1998. Dr. Phan has participated in and published studies on different aspects of hepatitis C therapy and has devoted his life’s work to being an expert in the treatment and cure for hepatitis though the study of hepatology.


Drs. Fiman, Davis and Trabanino

1111 Highway 6, Suite 105

Sugar Land, Texas 77406

(281) 491-9779

Dr. Charles Phan

16659 South West Freeway, Suite 175

Sugar Land, Texas 77479

(281) 277-2213

Drs. Vachhani and Peddamatham

16605 South West Freeway, Suite 435

Sugar Land, Texas 77479

(281) 342-9530

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