Dr. Benjamin H. Leach

Kevin Andrews is a primary care provider, practicing in Internal Medicine in Walla Walla, Washington. Dr. Andrews is rated as an Advanced provider by MediFind in the treatment of Viral Gastroenteritis. His top areas of expertise are Small Cell Lung Cancer (SCLC), Glucocorticoid-Remediable Aldosteronism, Hypertension, and Familial Hypertension. Dr. Andrews is currently accepting new patients.

Dr. Amber Charoen is a board-certified specialist in internal medicine and gastroenterology. She completed medical school at Rangsit University in Thailand with First Class Honors and Valedictorian. Based on peer nomination and her outstanding accomplishments, she was recognized by Castle Connolly Top Doctors as a 2024 Rising Star.Dr. Charoen arrived in the U.S. in 2015 as a research fellow specializing in pancreas, nutrition, and celiac disease at Beth Israel Deaconess Medical Center and Harvard Medical School. She continued her journey of excellence by completing her residency in internal medicine at MetroWest Medical Center/Tufts University School of Medicine in Framingham, Massachusetts. She then pursued a fellowship in gastroenterology at Rhode Island Hospital/Brown University in Providence, Rhode Island. Dr. Charoen has been recognized for her outstanding teaching with an Exemplary Teaching Award from Brown University and is the 2022 recipient of the Joseph A. DiMase Brown University Gastroenterology Research Award.Before joining Gastro Health of Tri-Cities, Dr. Charoen served as an Assistant Professor of Medicine at The Johns Hopkins University School of Medicine. Her clinical expertise spans GI upper endoscopy, colonoscopy screening, capsule endoscopy and women’s digestive health. Dr. Charoen was trained in one of only few centers in US that provide training in Women’s Gastrointestinal Medicine, focusing on gastroenterological issues unique to women. Dr. Charoen is rated as an Experienced provider by MediFind in the treatment of Viral Gastroenteritis. Her top areas of expertise are Colonic Malakoplakia, Childhood Volvulus, Portal Hypertension, Indigestion, and Endoscopy.

Lissette Ramierez is a primary care provider, practicing in Internal Medicine and Geriatrics in Richland, Washington. Dr. Ramierez is rated as an Advanced provider by MediFind in the treatment of Viral Gastroenteritis. Her top areas of expertise are Dementia, Renovascular Hypertension, Normal Pressure Hydrocephalus, and Myelodysplastic Syndrome (MDS).