International Classification of Diseases
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What is the International Classification of Diseases?
The International Classification of Diseases (ICD) is a diagnostic tool in medicine used to classify and monitor causes of injury and death and to maintain data for health analyses, such as the study of mortality and morbidity trends. The ICD aims to promote international compatibility in health data collection and reporting.
Some of the first attempts to classify diseases systematically occurred in the 1600s and 1700s. In 1893, the International Statistical Institute adopted the first international classification of diseases based on the Bertillon Classification of Causes of Death. After multiple revisions, the World Health Organization (WHO) took responsibility for publishing the ICD and collecting international data for general epidemiological surveillance and health management in 1948.
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Who creates and maintains the International Classification of Diseases?
The World Health Organization (WHO) is responsible for publishing the International Classification of Diseases (ICD) and collecting international data for general epidemiological surveillance and health management. The ICD is a diagnostic tool that classifies and monitors causes of injury and death and maintains information for health analyses, such as the study of mortality and morbidity trends.
The International Statistical Institute adopted the first international classification of diseases in 1893, which was based on the Bertillon Classification of Causes of Death. The ICD has been revised and updated over the years, with the WHO assuming responsibility for its publication in 1948.
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Why is the International Classification of Diseases important for health care?
The International Classification of Diseases (ICD) is a crucial diagnostic tool in medicine that classifies and monitors causes of injury and death, maintaining data for health analyses like mortality and morbidity trends. It promotes international compatibility in health data collection and reporting.
The World Health Organization (WHO) significantly revised the ICD in the 1980s and early 1990s, resulting in ICD-10, a three-volume work published in 1992 that eventually replaced ICD-9 worldwide. The ICD contains descriptions of all known diseases and injuries, detailing diagnostic characteristics and unique identifiers to code mortality data on death certificates and morbidity data from patient records.
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How do doctors and hospitals use the ICD in their work?
The International Classification of Diseases (ICD) is a diagnostic tool used to classify and monitor causes of injury and death, providing data for health analyses like mortality and morbidity trends. It promotes international compatibility in health data collection and reporting.
The ICD contains descriptions of all known diseases and injuries, each detailed with diagnostic characteristics and a unique identifier used to code mortality data on death certificates and morbidity data from patient and clinical records. Most countries use the ICD system to varying degrees, with some using it in its entirety and others using it only in hospitals or for morbidity.
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What are some examples of diseases or conditions listed in the ICD?
The International Classification of Diseases (ICD) is a diagnostic tool used to classify and monitor causes of injury and death, as well as to maintain data for health analyses. It contains descriptions of all known diseases and injuries, each detailed with diagnostic characteristics and a unique identifier.
The ICD utilizes a system of four-alphanumeric-character codes, ranging from A00.0 to Z99.0, to classify diseases. Examples of broad disease categories include mental and behavioral disorders, diseases of the circulatory system, and infectious and parasitic diseases. The ICD is revised periodically to reflect current medical knowledge; the 11th revision (ICD-11) was published in 2022.
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How has the International Classification of Diseases changed over time?
The International Classification of Diseases (ICD) is a diagnostic tool that classifies and monitors causes of injury and death and maintains data for health analyses.
Early attempts to classify diseases in the 1600s and 1700s lacked consistency. In 1893, the International Statistical Institute adopted the first international classification of diseases based on Jacques Bertillon's work. Bertillon's classification evolved into the ICD.
The World Health Organization (WHO) took over publishing the ICD in 1948 and significantly revised it, leading to ICD-10 in 1992, which replaced ICD-9. The ICD has become more detailed through repeated revisions. The U.S. Department of Health and Human Services developed ICD-9-CM for better clinical information. ICD-9-CM was replaced by ICD-10-CM in 2015 and ICD-11-CM in 2022.
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International Classification of Diseases (ICD), in medicine, diagnostic tool that is used to classify and monitor causes of injury and death and that maintains information for health analyses, such as the study of mortality (death) and morbidity (illness) trends. The ICD is designed to promote international compatibility in health data collecting and reporting.
History of the ICD
Some of the first attempts to systematically classify diseases were made in the 1600s and 1700s, though the resulting classifications were considered to be of little utility, largely as a result of inconsistencies in nomenclature and poor statistical data. During the 1800s the importance of creating a uniform system was realized, and several medical statisticians commissioned the completion of that task. The International Statistical Institute adopted the first international classification of diseases in 1893. The system was based on the Bertillon Classification of Causes of Death, developed by French statistician and demographer Jacques Bertillon. In 1898 the American Public Health Association recommended that Canada, Mexico, and the United States use that system and that it be revised every decade. In the following years Bertillon’s classification became known as the International List of Causes of Death and ultimately as the ICD.
The ICD became increasingly detailed through repeated revision, particularly after 1948, when the World Health Organization (WHO) assumed responsibility for publishing the ICD and began collecting international data for all general epidemiological surveillance and health management purposes. WHO significantly revised the ICD in the 1980s and early ’90s. The resulting three-volume work, known as ICD-10 (International Statistical Classification of Diseases and Related Health Problems), was published in 1992; it eventually replaced the two-volume ICD-9 in countries worldwide that used the classification. The ICD became a core classification of the WHO Family of International Classifications (WHO-FIC).
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Design of the ICD
The ICD contains a description of all known diseases and injuries. Each disease is detailed with diagnostic characteristics and given a unique identifier that is used to code mortality data on death certificates and morbidity data from patient and clinical records. The core of the ICD-10 uses one single list of four-alphanumeric-character codes from A00.0 to Z99.0 . The first letter of the code designates a different chapter; there are 22 chapters in total (several letters are included in a single chapter together). Within each chapter, the four-character codes are divided so that they specify different classification axes. The fourth character (the number after the decimal) is not required for reporting and is used in various ways.
Use of the ICD
Every country subscribing to the ICD system uses it in varying degrees. Most countries subscribe to the entirety of the ICD system, whereas some use the ICD in hospitals only and others for morbidity only. Some countries have chosen to implement partial code use. Differences in mortality classification coding between ICD-9 and ICD-10 prevented direct comparisons between the two, though a method to adjust for the change was introduced.
The U.S. Department of Health and Human Services felt that the ICD needed to provide better clinical information and developed a system that was referred to as ICD 9th revision: Clinical Modification (ICD-9-CM). The CM codes were more precise and allowed for strong analyses. The ICD-9-CM was used by hospitals and other health care facilities, particularly for reporting morbidity (the ICD-10 was used to report mortality data). The ICD-9-CM was replaced by the ICD-10-CM in 2015 and the latter by the ICD-11-CM in 2022..