International Statistical Classification of Diseases and Related Health Problems (ICD-11): from its origin to its use in digital systems

Abstract The International Statistical Classification of Diseases and Related Health Problems (ICD) allows the systematization of health statistics around the world. This study describes the origin, functionalities, forms of construction and updating of the CID, through a qualitative, exploratory and descriptive study focusing on document analysis, considering official documents and technological tools. Since its creation, the ICD has been revised and published, reflecting its connection to advances in health, science and society. Such reviews were accompanied by many studies, debates and consensus. The current version of the ICD, called ICD-11, in addition to traditional content revisions, has been transformed to better adapt to the digital world. This new version has been available in Portuguese since February 2024 and its implementation is in process in Brazil - a fact that requires preparation from all operators of the Unified Health System.