The purpose of this article is to review diagnosis-related group (DRG) systems by introducing the concept of disease groupings, describing the country-specific DRGs based on the International Classification of Diseases (ICD), and comparing country-specific disease classification systems and coding processes related to disease grouping. We discuss our findings with regard to the implications for disease groupings that may result from the upcoming adoption of ICD-11. This article is especially

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... evant for those working in health services who are involved in multicountry collaborations and require an understanding of the different DRGs used internationally, or who are preparing for the transition to ICD-11.