The document describes the MEDICAS model for a health information system (HIS). MEDICAS is a medical information system that covers a wide range of patient, provider, and healthcare activities. It contains comprehensive electronic health records and can be implemented across all health facilities. The system also allows connection and data exchange with regional and central health information structures. MEDICAS has different subsystems that health institutions can use depending on their specifics, including subsystems for basic healthcare, hospitals, specialist clinics, medical laboratories, and dental clinics.