Specialties: Dr. Dale Prokupek is a board-certified internist with a subspecialty in diseases of the GI tract. Our office is here to serve you - whether you need a primary care physician or treatment of a more complex intestinal issue. Established in 2002. Dr. Prokupek is an award winning Gastroenterologist and is proud to have been chosen as one of the top Internists in Los Angeles. Dr ....