Over five years, the medical insurance informatization has gone through milestones such as top-level design, full construction, deployment, acceptance check, and comprehensive application. Under the guidance of the National Healthcare Security Administration, healthcare security administration in various regions have further transformed ideas, from "having platforms" and "using platforms" to "good platforms" and "using platforms well", as well as from "having data" and "using data" to "good data" and "using data well". Data is the core component of new quality productive forces, and medical insurance big data has become a key driving force for improving and optimizing medical insurance services. This article explores the application scenarios of medical insurance big data in promoting the quality and efficiency improvement of medical insurance services by reviewing the development history of medical insurance data applications, and studying the current situation and problems of medical insurance big data applications, in order to provide references and ideas for empowering medical insurance services with medical insurance big data.