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Visit findatopdoc.com for all information on Dr. David S Lotsoff M.D., Gastroenterologist Gastroenterology in Chesterfield, MO, 63017. Profile, Reviews. David S Lotsoff specializes in gastroenterology in Lake Saint Louis, MO and has over 24 years of experience in the field of medicine. He graduated from Washington University School Of Medicine with his medical degree in 1997. He is affiliated with numerous hospitals in Missouri and more, including Mercy Hospital St Louis.