The history of the Indian Medical Department (IMD) dates back to 19th century. Initially starting as compounders and dressers in the three Presidency Medical Services they became Sub Surgeons and later on as Indian Medical Assistants in Indian Regiments. In 1868, they were redesignated as Hospital Assistants. In 1900, the Senior Hospital Assistants were granted the rank of Viceroy’s Commissioned Officers and in 1910 the designation was finally changed to Sub Assistant Surgeons of IMD. They were primarily for work with the Indian troops.