The increase in aged population in Taiwan increases the demand for elderly medical care, leading to the excessive use or waste of medical resources and other issues. The purpose of the research is to improve the problem of waste of medical resources by business process reengineering of the medical and health care institutions. Through literature reviews and studies of the current status of medical care in Taiwan, business process reengineering, hospital information systems, health level seven, and cloud health care, we were able to understand the public demand of medical and healthcare resources and to assess the information systems among existing medical institutions, labor and health insurance, and social welfare system. Through the process reengineering based on the policies performed by government agencies, the in-depth interviews, and investigation and analysis of expert’s opinion and secondary data, results of literatures were verified, problems in the existing medical and health care processes were identified, and the issue of waste of medical resources was improved. In this study, we developed the reengineered processes in the general medical institutions and the integrated medical and healthcare institutions. Results can be used to save time on exchanging information and improve the medical management systems and services. With future applications of cloud technology, the problems of wasting medical resource and rising social costs are expected to be solved.