This document provides an overview of a Hospital Information System (HIS). It discusses the key modules of an HIS including patient registration, appointment scheduling, admissions/discharges/transfers, doctor and nursing workbenches, pharmacy, laboratory, radiology, billing and more. The document also covers standards implemented in HIS like SNOMED and HIPAA. It notes that an HIS helps hospitals provide better quality care through integration of administrative, financial and clinical systems and increases productivity through reduced paperwork. Major HIS vendors are also mentioned.