Volume-2 ,Issue-5, May-2026

The International Classification of Diseases (ICD), developed by the World Health Organization (WHO), is a globally standardized system used for coding and classifying diseases, health conditions, injuries, and causes of death. This review paper evaluates the evolution of ICD from ICD-1 to ICD-11, highlighting major historical developments, structural changes, applications, challenges, and future perspectives. Over time, the ICD has evolved from simple mortality-based listings into a highly detailed, clinically relevant, and digitally integrated classification system. ICD-10 marked a major advancement with the introduction of an alphanumeric coding structure and widespread global adoption, while ICD-11 represents a transformative shift toward a fully digital, ontology-based system with enhanced flexibility and interoperability for integration with electronic health records and modern health information systems. The ICD system plays a crucial role in epidemiology, health policy formulation, clinical documentation, insurance processing, and global health reporting. However, challenges such as implementation complexity, training requirements, resource limitations, and data inconsistency continue to affect its optimal use, particularly in developing regions. With the increasing adoption of artificial intelligence and digital health technologies, ICD is expected to become an even more dynamic and intelligent tool for global health data management and decision-making.

Keyword: International Classification of Diseases (ICD); ICD evolution; ICD-10; ICD-11; disease classification system; medical coding; health informatics