Official financial invoice. Nanchang, referred to as "Hong" or "Chang", was called Zhang Yu and Hongdu in ancient times. It is a prefecture-level city, provincial capital and I-type big city under the jurisdiction of Jiangxi Province. Nanchang's medical insurance reimbursement invoice for urban residents can be a formal financial invoice. It is an important central city in the middle reaches of the Yangtze River in China and the central city of Poyang Lake Ecological Economic Zone confirmed by the State Council. By 2020, there will be 6 districts and 3 counties in the city, with a total area of 7 195 square kilometers; By the end of 20021,the permanent population was 6,437,500.