Given the large volume of data generated in hospitals, the usage of hospital information system (HIS) that may ease the hospital's workload on managing patient bills is critical. Thus, this paper presents the development of a web based hospital billing system which allows the staffs to manage and store patient bills in such a way that it can integrate bills from various departments. In addition to that, the system has additional features to allow down payments, automatically generate accounting

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... reports, as well as integrate some features of the registration and the pharmacy system. The system design followed the Waterfall approach and was done using the use case diagram, activity diagram, sequence diagram, and entity relationship diagram. The data processed was actual data from the hospital and dummy data for the pharmacy system. The system's functionality was tested using the black-box method and then evaluated by the hospital staffs using the SUS (System Usability Scale) method. From there, we obtained a score of 77.5 out of 100 from the SUS evaluation and 100% success rate from 102 features tested with the black-box testing method. Therefore, we can conclude that the new system works well and has good usability.