Legal basis: Article 3 of the Opinions of the General Office of the National Health Commission on Accelerating the Popularization and Application of Electronic Health Cards, according to the work requirements of "one card (code) communication" for regional diagnosis and treatment services, all provinces should focus on connecting the patient master index and medical card management system of self-built medical cards, bank-medical co-branded cards, primary medical care, maternal and child health care, planned immunization and other business systems to the electronic health card management service information system, and upgrading them to electronic health cards in batches through prefabrication. In the future, the new business system of residents' health service and internet medical service application software should be well connected with the electronic health card management service information system based on the national health information platform to avoid forming new information islands. Encourage Beijing-Tianjin-Hebei, Yangtze River Delta, Changsha-Zhuzhou-Xiangtan and other urban agglomerations to innovate and promote cross-regional medical information sharing and medical service collaboration based on one card (code).