ICD
The International Classification of Diseases (ICD) is the globally authoritative medical classification and terminology used in epidemiology, health management, clinical diagnosis, and health information management, resource allocation, clinican recording, decision support and health financing. It exists currently in its eleventh revision ICD-11 and it is notably different in detail and technology from all previous revisions of ICD. The ICD is maintained by the World Health Organization (WHO), which is the directing and coordinating authority for health within the United Nations System. The ICD provides a standardized framework for recording causes of illness and death, interoperability, comparing health data across countries and time periods, supporting reimbursement and resource allocation, and feeding automated decision support in clinical and public health settings. It maps health conditions to corresponding generic categories together with specific variations, each assigned a designated code. Its consistent application underpins international comparability in the collection, processing, and analysis of health statistics — a foundation for evidence-based health policy at both national and global levels.
The ICD is published by the WHO and used worldwide for morbidity and mortality recording and statistics, reimbursement systems, and automated decision support in health care. The ICD is a core system for healthcare-related issues of the WHO Family of International Classifications (WHO-FIC).
The ICD-11, as it is known, was adopted by WHO's World Health Assembly (WHA) on 25 May 2019 and officially came into effect on 1 January 2022. Unlike previous revisions — which were updated editions of a paper-based classification — ICD-11 represents a fundamental architectural redesign built from the outset for the digital age, introducing a common ontological foundation, postcoordination of clinical concepts, advanced interoperability with modern health information systems, and an annually updated API-accessible coding tool.
On 11 February 2022, the WHO stated that 35 countries were using the ICD-11. On 14 February 2023, the WHO reported that 64 countries were "in different stages of ICD-11 implementation". In May 2024, they stated that 50 countries were either conducting or expanding implementation pilots, and that 14 countries were actively using the ICD-11. As of July 2025, 132 WHO member states were at various stages of ICD-11 implementation.
The ICD is part of a "family" of international classifications (WHOFIC) that complement each other, including the following classifications:
the International Classification of Functioning, Disability and Health (ICF) that focuses on the domains of functioning (disability) associated with health conditions, from both medical and social perspectives, and
the International Classification of Health Interventions (ICHI) that classifies the whole range of medical, nursing, functioning and public health interventions.
The title of the ICD is formally the International Statistical Classification of Diseases and Related Health Problems; the original title, the International Classification of Diseases, is still the informal name by which the ICD is usually known.
In the United States and some other countries, the Diagnostic and Statistical Manual of Mental Disorders (DSM) is preferred when classifying mental disorders for certain purposes.
The ICD is currently the most widely used statistical classification system for diseases in the world. In addition, some countries—including Australia, Canada, and the United States—have developed their own adaptations of ICD, with more procedure codes for classification of operative or diagnostic procedures.
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