Health institution requires quality data and information management to function effectively and efficiently. It is an understatement to say that many organizations, institutions or government agencies have become critically dependent on the use of database system for their successes especially in the hospital. This work aims at developing an improved hospital information management system using a function-based approach. An efficient HIMS that can be used to manage patient information and its administration is presented in this work. This is with the goal of eradicating the problem of improper data keeping, inaccurate reports, wastage of time in storing, processing and retrieving information faced by the existing hospital information system in order to improve the overall efficiency of the health institution. The system was developed with Hypertext Markup Language (HTML), Cascading Style Sheets (CSS), Hypertext Preprocessor (PHP), and My Structured Query Language (MySQL). The new system was tested using data collected from Renewal Clinic, Ibadan, Nigeria was used as case study were the data for the research was collected and the system was tested. The system provides a vital platform of information storage and retrieval in hospitals.