Health Code (Chinese name: 健康码) is a type of application used during COVID-19 in mainland China. It is used as an e-passport that reports if the user has been in an area with current cases of infection. An applicant provides information such as travel history, residence, and medical records. The application will then generate a QR code that identifies the individual's risk level as red, yellow, or green. As of April 2020, over 200 cities and 20 provinces employed health code supported by Alipay. There are a wide range of health codes run by different localities.