International Classification of Diseases: Difference between revisions

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{{Short description|International standard diagnostic tool}}
{{Short description|International standard diagnostic tool}}
{{Redirect|ICD}}
{{Redirect|ICD}}
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The '''International Classification of Diseases''' ('''ICD''') is the globally authoritative [[medical classification]] and terminology used in [[epidemiology]], [[health management]], clinical [[diagnostics|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]].<ref>{{cite web|url=https://www.who.int/about/en |title=About WHO |access-date=14 March 2014 |url-status=live |publisher=World Health Organization |archive-date=9 February 2014 |archive-url=https://web.archive.org/web/20140209050225/http://www.who.int/about/en}}</ref> 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 [[clinical decision support system|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 '''International Classification of Diseases''' ('''ICD''') is a globally used [[medical classification]] that is used in [[epidemiology]], [[health management]] and clinical [[diagnostics|diagnosis]]. The ICD is maintained by the [[World Health Organization]] (WHO), which is the directing and coordinating authority for health within the [[United Nations System]].<ref>{{cite web|url=https://www.who.int/about/en |title=About WHO |access-date=14 March 2014 |url-status=live |publisher=World Health Organization |archive-date=9 February 2014 |archive-url=https://web.archive.org/web/20140209050225/http://www.who.int/about/en}}</ref> The ICD was originally designed as a [[health care]] classification system, providing a system of diagnostic codes for classifying [[disease]]s, including nuanced classifications of a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances, and external causes of injury or disease. This system is designed to map health conditions to corresponding generic categories together with specific variations; for these designated codes are assigned, each up to six characters long. Thus each major category is designed to include a set of similar diseases.
The ICD is published by the WHO and used worldwide for [[morbidity]] and [[Mortality rate|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 [[Medical classification#WHO Family of International Classifications|WHO Family of International Classifications]] (WHO-FIC).<ref name="WHO-FIC">{{cite web |title=The WHO Family of International Classifications |url=https://www.who.int/classifications/en |archive-url=https://web.archive.org/web/20131222042324/http://www.who.int/classifications/en |archive-date=22 December 2013 |access-date=14 March 2014 |publisher=World Health Organization}}</ref>


The ICD is published by the WHO and used worldwide for [[morbidity]] and mortality statistics, [[reimbursement]] systems, and automated decision support in health care. This system is designed to promote international comparability in the collection, processing, classification, and presentation of these statistics. The ICD is a major project to statistically classify all health disorders and to provide diagnostic assistance. The ICD is a core system for healthcare-related issues of the [[Medical classification#WHO Family of International Classifications|WHO Family of International Classifications]] (WHO-FIC).<ref name="WHO-FIC">{{cite web |title=The WHO Family of International Classifications |url=https://www.who.int/classifications/en |url-status= |archive-url=https://web.archive.org/web/20131222042324/http://www.who.int/classifications/en |archive-date=22 December 2013 |access-date=14 March 2014 |publisher=World Health Organization}}</ref>
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.<ref>{{Cite news|url=https://www.who.int/news-room/detail/25-05-2019-world-health-assembly-update|title=World Health Assembly Update, 25 May 2019|date=25 May 2019}}</ref> 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 [[ontology|ontological]] foundation, [[postcoordination]] of clinical concepts, advanced [[interoperability]] with modern [[health information system]]s, and an annually updated [[application programming interface|API]]-accessible coding tool.


The ICD is revised periodically and is currently in its 11th revision. The [[ICD-11]], as it is known, was accepted by WHO's [[World Health Assembly]] (WHA) on 25 May 2019 and officially came into effect on 1 January 2022.<ref>{{Cite news|url=https://www.who.int/news-room/detail/25-05-2019-world-health-assembly-update|title=World Health Assembly Update, 25 May 2019|date=25 May 2019}}</ref> On 11 February 2022, the WHO stated that 35 countries were using the ICD-11.<ref>{{cite web | author=WHO | title=ICD-11 2022 release | url=https://www.who.int/news/item/11-02-2022-icd-11-2022-release | date=11 February 2022 | website=who.int | archive-url=https://web.archive.org/web/20220210221848/https://www.who.int/news/item/11-02-2022-icd-11-2022-release | archive-date=10 February 2022 | url-status=live}}</ref>
On 11 February 2022, the WHO stated that 35 countries were using the ICD-11.<ref>{{cite web | author=WHO | title=ICD-11 2022 release | url=https://www.who.int/news/item/11-02-2022-icd-11-2022-release | date=11 February 2022 | website=who.int | archive-url=https://web.archive.org/web/20220210221848/https://www.who.int/news/item/11-02-2022-icd-11-2022-release | archive-date=10 February 2022 | url-status=live}}</ref> On 14 February 2023, the WHO reported that 64 countries were "in different stages of ICD-11 implementation".<ref>{{Cite web | author=WHO | title=ICD-11 2023 release is here | website=who.int | url=https://www.who.int/news/item/14-02-2023-icd-11-2023-release-is-here | archive-url=https://web.archive.org/web/20231208091346/https://www.who.int/news/item/14-02-2023-icd-11-2023-release-is-here | archive-date=8 December 2023 | url-status=live}}</ref> 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.<ref>{{Cite web | author=WHO | title=International Classification of Diseases (ICD) | url=https://www.who.int/classifications/classification-of-diseases | website=who.int | archive-url=https://web.archive.org/web/20240528143046/https://www.who.int/standards/classifications/classification-of-diseases | archive-date=28 May 2024 | url-status=live}}</ref> As of July 2025, 132 [[WHO member states]] were at various stages of ICD-11 implementation.<ref>{{cite web | title=ICD-11 | url=https://ifhima.org/publication-resources/articles/icd-11/ | publisher=International Federation of Health Information Management Associations | access-date=March 26, 2026}}</ref>


The ICD is part of [[Medical classification#WHO Family of International Classifications|a "family" of international classifications]] (WHOFIC) that complement each other, including the following classifications:
The ICD is part of [[Medical classification#WHO Family of International Classifications|a "family" of international classifications]] (WHOFIC) that complement each other, including the following classifications:
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== Early history ==
== Early history ==
{{More citations needed section|date=July 2017}}
{{More citations needed section|date=July 2017}}
In 1860, during the international statistical congress held in London, [[Florence Nightingale]] made a proposal that was to result in the development of the first model of systematic collection of hospital data. In 1893, a French physician, [[Jacques Bertillon]], introduced the ''Bertillon Classification of Causes of Death'' at a congress of the [[International Statistical Institute]] (ISI) in Chicago.<ref>[https://archive.org/search.php?query=%28%28subject%3A%22Bertillon%2C%20Jacques%22%20OR%20subject%3A%22Jacques%20Bertillon%22%20OR%20creator%3A%22Bertillon%2C%20Jacques%22%20OR%20creator%3A%22Jacques%20Bertillon%22%20OR%20creator%3A%22Bertillon%2C%20J%2E%22%20OR%20title%3A%22Jacques%20Bertillon%22%20OR%20description%3A%22Bertillon%2C%20Jacques%22%20OR%20description%3A%22Jacques%20Bertillon%22%29%20OR%20%28%221851-1922%22%20AND%20Bertillon%29%29%20AND%20%28-mediatype:software%29 Works of Jacques Bertillon], Internet Archive.</ref><ref name="History">{{cite web|url=https://www.who.int/entity/classifications/icd/en/HistoryOfICD.pdf|title=''History of the development of the ICD''.|website=Who.int|access-date=11 December 2017}}</ref>
In 1860, during the international statistical congress held in London, [[Florence Nightingale]] made a proposal that was to result in the development of the first model of systematic collection of hospital data. In 1893, a French physician, [[Jacques Bertillon]], introduced the ''Bertillon Classification of Causes of Death'' at a congress of the [[International Statistical Institute]] (ISI) in Chicago.<ref>[https://archive.org/search.php?query=%28%28subject%3A%22Bertillon%2C%20Jacques%22%20OR%20subject%3A%22Jacques%20Bertillon%22%20OR%20creator%3A%22Bertillon%2C%20Jacques%22%20OR%20creator%3A%22Jacques%20Bertillon%22%20OR%20creator%3A%22Bertillon%2C%20J%2E%22%20OR%20title%3A%22Jacques%20Bertillon%22%20OR%20description%3A%22Bertillon%2C%20Jacques%22%20OR%20description%3A%22Jacques%20Bertillon%22%29%20OR%20%28%221851-1922%22%20AND%20Bertillon%29%29%20AND%20%28-mediatype:software%29 Works of Jacques Bertillon], Internet Archive.</ref><ref name="History">{{cite web|url=https://www.who.int/entity/classifications/icd/en/HistoryOfICD.pdf|title=''History of the development of the ICD''.|website=Who.int|access-date=11 December 2017|archive-url=http://web.archive.org/web/20090115224527/https://www.who.int/entity/classifications/icd/en/HistoryOfICD.pdf|archive-date=2009-01-15}}</ref>


A number of countries adopted Bertillon's system, which was based on the principle of distinguishing between general diseases and those localized to a particular organ or anatomical site, as used by the City of Paris for classifying deaths. Subsequent revisions represented a synthesis of English, German, and Swiss classifications, expanding from the original 44 titles to 161 titles.  
A number of countries adopted Bertillon's system, which was based on the principle of distinguishing between general diseases and those localized to a particular organ or anatomical site, as used by the City of Paris for classifying deaths. Subsequent revisions represented a synthesis of English, German, and Swiss classifications, expanding from the original 44 titles to 161 titles.  
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The revisions that followed contained minor changes. Responsibility for ICD revisions fell to the Mixed Commission, a group composed of representatives from the ISI and the Health Organization of the [[League of Nations]].  
The revisions that followed contained minor changes. Responsibility for ICD revisions fell to the Mixed Commission, a group composed of representatives from the ISI and the Health Organization of the [[League of Nations]].  


==Versions of the International Classification of Diseases==
==Versions==
===ICD-6===
===ICD-6===
In 1948, the WHO assumed responsibility for preparing and publishing the revisions to the ICD every ten years.<ref>{{Cite journal |last1=Zhavoronkov |first1=Alex |last2=Bhullar |first2=Bhupinder |date=2015-11-04 |title=Classifying aging as a disease in the context of ICD-11 |journal=Frontiers in Genetics |volume=6 |page=326 |doi=10.3389/fgene.2015.00326 |issn=1664-8021 |pmc=4631811 |pmid=26583032 |doi-access=free}}</ref> (It later became clear that the established ten year interval between revisions was too short.)
In 1948, the WHO assumed responsibility for preparing and publishing the revisions to the ICD every ten years.<ref>{{Cite journal |last1=Zhavoronkov |first1=Alex |last2=Bhullar |first2=Bhupinder |date=2015-11-04 |title=Classifying aging as a disease in the context of ICD-11 |journal=Frontiers in Genetics |volume=6 |page=326 |doi=10.3389/fgene.2015.00326 |issn=1664-8021 |pmc=4631811 |pmid=26583032 |doi-access=free}}</ref> (It later became clear that the established ten year interval between revisions was too short.)
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==== ICDA-8 (United States) ====
==== ICDA-8 (United States) ====
In the US, a group of consultants was asked to study the ICD-8 for its applicability to various users in the United States. This group recommended that further detail be provided for coding hospital and morbidity data. The American Hospital Association's "Advisory Committee to the Central Office on ICDA" developed the needed adaptation proposals, resulting in the publication of the International Classification of Diseases, Adapted (ICDA). In 1968, the United States Public Health Service published the International Classification of Diseases, Adapted, 8th Revision for use in the United States (ICDA-8). Beginning in 1968, ICDA-8 served as the basis for coding diagnostic data for both official morbidity and mortality statistics in the United States.<ref name="volume2" /><ref name="cdc">{{cite web|url=http://wonder.cdc.gov/wonder/sci_data/codes/icd9/type_txt/icd9cm.asp|title=International Classification Of Diseases – 9 – CM, (1979)|website=CDC WONDER|access-date=11 December 2017 |url-status=dead |archive-url=https://web.archive.org/web/20171212193143/http://wonder.cdc.gov/wonder/sci_data/codes/icd9/type_txt/icd9cm.asp |archive-date= Dec 12, 2017 }}</ref>
In the US, a group of consultants was asked to study the ICD-8 for its applicability to various users in the United States. This group recommended that further detail be provided for coding hospital and morbidity data. The American Hospital Association's "Advisory Committee to the Central Office on ICDA" developed the needed adaptation proposals, resulting in the publication of the International Classification of Diseases, Adapted (ICDA). In 1968, the United States Public Health Service published the International Classification of Diseases, Adapted, 8th Revision for use in the United States (ICDA-8). Beginning in 1968, ICDA-8 served as the basis for coding diagnostic data for both official morbidity and mortality statistics in the United States.<ref name="volume2" /><ref name="cdc">{{cite web|url=http://wonder.cdc.gov/wonder/sci_data/codes/icd9/type_txt/icd9cm.asp|title=International Classification Of Diseases – 9 – CM, (1979)|website=CDC WONDER|access-date=11 December 2017 |archive-url=https://web.archive.org/web/20171212193143/http://wonder.cdc.gov/wonder/sci_data/codes/icd9/type_txt/icd9cm.asp |archive-date= Dec 12, 2017 }}</ref><ref>{{Cite book |last=Service |first=United States Public Health |url=https://books.google.com/books?id=5YGm4I6m3OcC |title=Eighth Revision: International Classification of Diseases, Adapted for Use in the United States, ICDA. |date=1969 |language=en}}</ref>


===ICD-9{{Anchor|ICDM 9|ICDM-9}}===
===ICD-9{{Anchor|ICDM 9|ICDM-9}}===
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* [[ICD-10-PCS]], for [[procedure codes]], replaces volume 3. Annual updates are provided.
* [[ICD-10-PCS]], for [[procedure codes]], replaces volume 3. Annual updates are provided.


On 21 August 2008, the [[US Department of Health and Human Services]] (HHS) proposed new code sets to be used for reporting diagnoses and procedures on health care transactions. Under the proposal, the ICD-9-CM code sets would be replaced with the ICD-10-CM code sets, effective 1 October 2013. On 17 April 2012 the Department of Health and Human Services (HHS) published a proposed rule that would delay, from 1 October 2013 to 1 October 2014, the compliance date for the ICD-10-CM and PCS.<ref>{{cite web |url=https://www.cdc.gov/nchs/about/otheract/icd9/abticd10.htm |title=Classification of Diseases, Functioning, and Disability |publisher=[[Centers for Disease Control and Prevention]] |access-date=29 October 2010 }}</ref> Once again, Congress delayed implementation date to 1 October 2015, after it was inserted into "Doc Fix" Bill without debate over objections of many.
On 21 August 2008, the [[US Department of Health and Human Services]] (HHS) proposed new code sets to be used for reporting diagnoses and procedures on health care transactions. Under the proposal, the ICD-9-CM code sets would be replaced with the ICD-10-CM code sets, effective 1 October 2013. On 17 April 2012 the Department of Health and Human Services (HHS) published a proposed rule that would delay, from 1 October 2013 to 1 October 2014, the compliance date for the ICD-10-CM and PCS.<ref>{{cite web |url=https://www.cdc.gov/nchs/about/otheract/icd9/abticd10.htm |title=Classification of Diseases, Functioning, and Disability |publisher=[[Centers for Disease Control and Prevention]] |access-date=29 October 2010 |archive-url=http://web.archive.org/web/20090101023148/https://www.cdc.gov/nchs/about/otheract/icd9/abticd10.htm|archive-date=2009-01-01}}</ref> Once again, Congress delayed implementation date to 1 October 2015, after it was inserted into "Doc Fix" Bill without debate over objections of many.


Revisions to ICD-10-CM Include:
Revisions to ICD-10-CM Include:
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{{Main|ICD-11}}
{{Main|ICD-11}}
[[File:ICD-11 Beta browser icon.png|frameless|right]]
[[File:ICD-11 Beta browser icon.png|frameless|right]]
 
The eleventh revision of the International Classification of Diseases, or the [[ICD-11]], is almost five times as big as the ICD-10.<ref>{{Cite journal | author=Editorial | date=2019 | title=ICD-11 | journal=[[The Lancet]] | volume=393 | issue=10188 | page=2275 | doi=10.1016/S0140-6736(19)31205-X| pmid=31180012 | doi-access=free }}</ref> It was created following a decade of development involving over 300 specialists from 55 countries.<ref>{{Cite report | first=Azza | last=Badr | title=Fifth regional steering group meeting Bangkok | url=http://getinthepicture.org/system/files/ICD-11%20-%20WHO.pdf | date=17–19 September 2019}} [[WHO]]/[http://www.emro.who.int/ EMRO].</ref><ref>{{Cite report | first1=Donna | last1=Pickett  | first2=Robert N. | last2=Anderson | title=Status on ICD-11: The WHO Launch | url=https://ncvhs.hhs.gov/wp-content/uploads/2018/08/ICD-11_WHO-v_7-17-2018.pdf | date=18 July 2018 | publisher=[[Centers for Disease Control and Prevention|CDC]]/[[National Center for Health Statistics|NCHS]]}}</ref> Following an [[alpha version]] in May 2011 and a [[Beta version|beta draft]] in May 2012, a stable version of the ICD-11 was released on 18 June 2018,<ref>{{Cite web | title=ICD-11 Timeline | url=https://www.who.int/classifications/icd/revision/timeline/en/ | website=who.int | archive-url=https://web.archive.org/web/20190505082818/https://www.who.int/classifications/icd/revision/timeline/en/ | archive-date=5 May 2019 | url-status=live}}</ref> and officially endorsed by all WHO members during the 72nd [[World Health Assembly]] on 25 May 2019.<ref>{{Cite press release | title=World Health Assembly Update, 25 May 2019 | url=https://www.who.int/news-room/detail/25-05-2019-world-health-assembly-update | publisher=WHO | location=Geneva, Switzerland | date=25 May 2019 | archive-url=https://web.archive.org/web/20190730052948/https://www.who.int/news-room/detail/25-05-2019-world-health-assembly-update | archive-date=30 July 2019 | url-status=live}}</ref>
 
The eleventh revision of the International Classification of Diseases, or the [[ICD-11]], is almost five times as big as the ICD-10.<ref>{{Cite journal | author=Editorial | date=2019 | title=ICD-11 | journal=[[The Lancet]] | volume=393 | issue=10188 | page=2275 | doi=10.1016/S0140-6736(19)31205-X| pmid=31180012 | doi-access=free }}</ref> It was created following a decade of development involving over 300 specialists from 55 countries.<ref>{{Cite report | first=Azza | last=Badr | title=Fifth regional steering group meeting Bangkok | url=http://getinthepicture.org/system/files/ICD-11%20-%20WHO.pdf | date=17–19 September 2019}} [[WHO]]/[http://www.emro.who.int/ EMRO].</ref><ref>{{Cite report | first1=Donna | last1=Pickett  | first2=Robert N. | last2=Anderson | title=Status on ICD-11: The WHO Launch | url=https://ncvhs.hhs.gov/wp-content/uploads/2018/08/ICD-11_WHO-v_7-17-2018.pdf | date=18 July 2018 | publisher=[[Centers for Disease Control and Prevention|CDC]]/[[National Center for Health Statistics|NCHS]]}}</ref><ref>{{Cite news | first=Arlin | last=Cuncic | title=Overview of the ICD-11 for Mental Health | url=https://www.google.com/search?q=How+Does+the+ICD-11+Compare+to+the+DSM-5%3F+Verywell | date=23 March 2020 | work=[[Verywell Mind]] | archive-url=https://archive.today/20200405194700/https://www.verywellmind.com/overview-of-the-icd-11-4589392 |archive-date=5 April 2020 | url-status=live}}</ref> Following an [[alpha version]] in May 2011 and a [[Beta version|beta draft]] in May 2012, a stable version of the ICD-11 was released on 18 June 2018,<ref>{{Cite web | title=ICD-11 Timeline | url=https://www.who.int/classifications/icd/revision/timeline/en/ | website=who.int | archive-url=https://web.archive.org/web/20190505082818/https://www.who.int/classifications/icd/revision/timeline/en/ | archive-date=5 May 2019 | url-status=live}}</ref> and officially endorsed by all WHO members during the 72nd [[World Health Assembly]] on 25 May 2019.<ref>{{Cite press release | title=World Health Assembly Update, 25 May 2019 | url=https://www.who.int/news-room/detail/25-05-2019-world-health-assembly-update | publisher=WHO | location=Geneva, Switzerland | date=25 May 2019 | archive-url=https://web.archive.org/web/20190730052948/https://www.who.int/news-room/detail/25-05-2019-world-health-assembly-update | archive-date=30 July 2019 | url-status=live}}</ref>


For the ICD-11, the WHO decided to differentiate between the core of the system and its derived specialty versions, such as the [[ICD-O]] for [[oncology]]. As such, the collection of all ICD entities is called the Foundation Component. From this common core, subsets can be derived. The primary derivative of the Foundation is called the ICD-11 MMS, and it is this system that is commonly referred to and recognized as "the ICD-11".<ref>{{Cite journal | first=Christopher G. | last=Chute | date=2018 | title=The rendering of human phenotype and rare diseases in ICD-11 | journal=[[Journal of Inherited Metabolic Disease]] | volume=41 | issue=3 | pages=563–569 | doi=10.1007/s10545-018-0172-5 | pmid=29600497 | pmc=5959961 | quote=<small>The primary linearization, and the one most users will recognize and likely believe is "the ICD-11", is the Mortality and Morbidity Statistics (MMS) linearization.</small>| doi-access=free }}</ref> MMS stands for Mortality and Morbidity Statistics.
For the ICD-11, the WHO decided to differentiate between the core of the system and its derived specialty versions, such as the [[ICD-O]] for [[oncology]]. As such, the collection of all ICD entities is called the Foundation Component. From this common core, subsets can be derived. The primary derivative of the Foundation is called the ICD-11 MMS, and it is this system that is commonly referred to and recognized as "the ICD-11".<ref>{{Cite journal | first=Christopher G. | last=Chute | date=2018 | title=The rendering of human phenotype and rare diseases in ICD-11 | journal=[[Journal of Inherited Metabolic Disease]] | volume=41 | issue=3 | pages=563–569 | doi=10.1007/s10545-018-0172-5 | pmid=29600497 | pmc=5959961 | quote=<small>The primary linearization, and the one most users will recognize and likely believe is "the ICD-11", is the Mortality and Morbidity Statistics (MMS) linearization.</small>| doi-access=free }}</ref> MMS stands for Mortality and Morbidity Statistics.
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ICD-11 comes with an implementation package that includes transition tables from and to ICD-10, a translation tool, a coding tool, web-services, the [[ICD-11 CDDR]] (a DSM-like manual for Chapter 06), training material, and more.<ref>{{cite journal |title=Semantic Alignment between ICD-11 and SNOMED CT |journal=Studies in Health Technology and Informatics |volume=216 |issue=MEDINFO 2015: eHealth–enabled Health |doi=10.3233/978-1-61499-564-7-790 |url=https://www.researchgate.net/publication/281449994 |language=en|year=2015 |author1=Rodrigues Jean-Marie |author2=Robinson David |author3=Della Mea Vincenzo |author4=Campbell James |author5=Rector Alan |author6=Schulz Stefan |author7=Brear Hazel |author8=Üstün Bedirhan |author9=Spackman Kent |author10=Chute Christopher G |author11=Millar Jane |author12=Solbrig Harold |author13=Brand Persson Kristina }}</ref> All tools are accessible after self-registration from the [https://icd.who.int/dev11/l-m/en Maintenance Platform].
ICD-11 comes with an implementation package that includes transition tables from and to ICD-10, a translation tool, a coding tool, web-services, the [[ICD-11 CDDR]] (a DSM-like manual for Chapter 06), training material, and more.<ref>{{cite journal |title=Semantic Alignment between ICD-11 and SNOMED CT |journal=Studies in Health Technology and Informatics |volume=216 |issue=MEDINFO 2015: eHealth–enabled Health |doi=10.3233/978-1-61499-564-7-790 |url=https://www.researchgate.net/publication/281449994 |language=en|year=2015 |author1=Rodrigues Jean-Marie |author2=Robinson David |author3=Della Mea Vincenzo |author4=Campbell James |author5=Rector Alan |author6=Schulz Stefan |author7=Brear Hazel |author8=Üstün Bedirhan |author9=Spackman Kent |author10=Chute Christopher G |author11=Millar Jane |author12=Solbrig Harold |author13=Brand Persson Kristina }}</ref> All tools are accessible after self-registration from the [https://icd.who.int/dev11/l-m/en Maintenance Platform].


The ICD-11 ''officially'' came into effect on 1 January 2022, although the WHO admitted that "not many countries are likely to adapt that quickly".<ref>{{Cite web | author=WHO | date=2018 | title=ICD-11: Classifying disease to map the way we live and die | url= https://www.who.int/health-topics/international-classification-of-diseases | archive-url=https://web.archive.org/web/20180620014204/https://www.who.int/health-topics/international-classification-of-diseases | website=www.who.int | archive-date=20 June 2018 | url-status=dead}}</ref> In the United States, the advisory body of the [[United States Secretary of Health and Human Services|Secretary of Health and Human Services]] in 2019 gave an expected release year of 2025.<ref>{{Cite news | author=admin aapc | title=US gets the ball rolling on ICD-11 | url=https://www.aapc.com/blog/48275-us-gets-the-ball-rolling-on-icd-11/ | date=16 August 2019 | work=[[AAPC (healthcare)|AAPC]]}}</ref> However by April 2024, with little progress towards ICD-11 adoption having been made, the advisory body was recommending that the Secretary urgently appoint a central office or agency to take responsibility for co-ordinating the adoption of ICD-11 in the United States.<Ref>{{cite web |author=Jacki Monson, Chair of National Committee on Vital and Health Statistics |date= 2024-04-18|title= Urgent Need for a Central Coordinating Entity for Planning and Adopting ICD-11 in the U.S. |website=NCVHS |url=https://ncvhs.hhs.gov/wp-content/uploads/2024/05/NCVHS-ICD-11-Recommendation-Letter-for-website_508.pdf |publisher= |url-status=live |archive-url=https://web.archive.org/web/20250126231700/https://ncvhs.hhs.gov/wp-content/uploads/2024/05/NCVHS-ICD-11-Recommendation-Letter-for-website_508.pdf |archive-date=2025-01-26}}</ref>
The ICD-11 ''officially'' came into effect on 1 January 2022, although the WHO admitted that "not many countries are likely to adapt that quickly".<ref>{{Cite web | author=WHO | date=2018 | title=ICD-11: Classifying disease to map the way we live and die | url= https://www.who.int/health-topics/international-classification-of-diseases | archive-url=https://web.archive.org/web/20180620014204/https://www.who.int/health-topics/international-classification-of-diseases | website=www.who.int | archive-date=20 June 2018 }}</ref> In the United States, the advisory body of the [[United States Secretary of Health and Human Services|Secretary of Health and Human Services]] in 2019 gave an expected release year of 2025.<ref>{{Cite news | author=admin aapc | title=US gets the ball rolling on ICD-11 | url=https://www.aapc.com/blog/48275-us-gets-the-ball-rolling-on-icd-11/ | date=16 August 2019 | work=[[AAPC (healthcare)|AAPC]]}}</ref> However by April 2024, with little progress towards ICD-11 adoption having been made, the advisory body was recommending that the Secretary urgently appoint a central office or agency to take responsibility for co-ordinating the adoption of ICD-11 in the United States.<ref>{{cite web |author=Jacki Monson, Chair of National Committee on Vital and Health Statistics |date= 2024-04-18|title= Urgent Need for a Central Coordinating Entity for Planning and Adopting ICD-11 in the U.S. |website=NCVHS |url=https://ncvhs.hhs.gov/wp-content/uploads/2024/05/NCVHS-ICD-11-Recommendation-Letter-for-website_508.pdf |publisher= |url-status=live |archive-url=https://web.archive.org/web/20250126231700/https://ncvhs.hhs.gov/wp-content/uploads/2024/05/NCVHS-ICD-11-Recommendation-Letter-for-website_508.pdf |archive-date=2025-01-26}}</ref> In China, the [[National Health Commission]] endorsed the transition to ICD-11 in 2018, and in 2023 a national pilot of the ICD-11 morbidity coding was carried out.<ref>{{Cite journal |last=Zhang |first=Meng |last2=Wang |first2=Yipeng |last3=Jakob |first3=Robert |last4=Su |first4=Shanna |last5=Bai |first5=Xue |last6=Jing |first6=Xiaotong |last7=Xue |first7=Xin |last8=Liao |first8=Aimin |last9=Li |first9=Naishi |last10=Wang |first10=Yi |date=2024-04-19 |title=Methodologies and key considerations for implementing the International Classification of Diseases-11th revision morbidity coding: insights from a national pilot study in China |url=https://academic.oup.com/jamia/article/31/5/1084/7617408 |journal=Journal of the American Medical Informatics Association |language=en |volume=31 |issue=5 |pages=1084–1092 |doi=10.1093/jamia/ocae031 |issn=1067-5027 |pmc=11031236 |pmid=38427850}}</ref>


== Usage in the United States ==
== Usage in the United States ==
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Cause of death on United States death certificates, statistically compiled by the [[Centers for Disease Control and Prevention]] (CDC), are coded in the ICD, which does not include codes for human and system factors commonly called [[medical errors]].<ref>{{cite journal|last1=Makary|first1=MA|last2=Daniel|first2=M|title=Medical error—the third leading cause of death in the US|journal=BMJ|volume=353|date=3 May 2016|pages=i2139|doi=10.1136/bmj.i2139|pmid=27143499|s2cid=206910205|url=http://www.bmj.com/content/353/bmj.i2139|url-access=subscription}}</ref><ref>{{cite book|last1=Moriyama|first1=IM|last2=Loy|first2=RM|last3=Robb-Smith|first3=AHT|editor1-last=Rosenberg|editor1-first=HM|editor2-last=Hoyert|editor2-first=DL|title=History of the Statistical Classification of Diseases and Causes of Death|date=2011|publisher=US Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics|location=Hyattsville, MD|isbn=978-0-8406-0644-0|url=https://www.cdc.gov/nchs/data/misc/classification_diseases2011.pdf}}</ref>
Cause of death on United States death certificates, statistically compiled by the [[Centers for Disease Control and Prevention]] (CDC), are coded in the ICD, which does not include codes for human and system factors commonly called [[medical errors]].<ref>{{cite journal|last1=Makary|first1=MA|last2=Daniel|first2=M|title=Medical error—the third leading cause of death in the US|journal=BMJ|volume=353|date=3 May 2016|article-number=i2139|doi=10.1136/bmj.i2139|pmid=27143499|s2cid=206910205|url=http://www.bmj.com/content/353/bmj.i2139|url-access=subscription}}</ref><ref>{{cite book|last1=Moriyama|first1=IM|last2=Loy|first2=RM|last3=Robb-Smith|first3=AHT|editor1-last=Rosenberg|editor1-first=HM|editor2-last=Hoyert|editor2-first=DL|title=History of the Statistical Classification of Diseases and Causes of Death|date=2011|publisher=US Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics|location=Hyattsville, MD|isbn=978-0-8406-0644-0|url=https://www.cdc.gov/nchs/data/misc/classification_diseases2011.pdf}}</ref>


== Usage in the European Union ==
== Usage in the European Union ==


Some EU countries use the ICD to compute the maximum [[Abbreviated Injury Scale]] for traffic statistics.<ref>https://road-safety.transport.ec.europa.eu/document/download/e064d1a6-fc33-4e67-8c0d-650fc91ced85_en?filename=ff_serious_injuries_20230303.pdf {{Bare URL PDF|date=June 2025}}</ref>
Some EU countries use the ICD to compute the maximum [[Abbreviated Injury Scale]] for traffic statistics.<ref>{{cite book |last1=Slootmans |first1=Freya |last2=Bouwen |first2=Lies |title=European Commission (2023) Facts and Figures Serious injuries. European Road Safety Observatory |date=January 2023 |publisher= European Commission, Directorate General for Transport |location=Brussels |url=https://road-safety.transport.ec.europa.eu/document/download/e064d1a6-fc33-4e67-8c0d-650fc91ced85_en?filename=ff_serious_injuries_20230303.pdf}}</ref>


==Mental health conditions==
==Mental health conditions==
The various ICD editions include sections that classify mental and behavioural disorders. The ''ICD-10 Classification of Mental and Behavioural Disorders: Clinical Descriptions and Diagnostic Guidelines'' – also known as the "blue book" – is derived from Chapter {{rn|V}} of ICD-10 and gives the diagnostic criteria for the conditions listed at each [[Diagnosis code|category]] therein. The blue book was developed separately to, but coexists with, the [[Diagnostic and Statistical Manual of Mental Disorders]] (DSM) of the [[American Psychiatric Association]]—though both seek to use the same diagnostic [[Nosology#Types of classification|classifications]]. A survey of psychiatrists in 66 countries comparing use of the ICD-10 and DSM-IV found that the former was more often used for clinical diagnosis while the latter was more valued for research.<ref>{{cite journal|last=Juan E. Mezzich|year=2002|title=International Surveys on the Use of ICD-10 and Related Diagnostic Systems|url=https://books.google.com/books?id=EE-YRUki3LEC&pg=PA72|format=guest editorial, abstract|journal=Psychopathology|volume=35|issue=2–3|pages=72–75|doi=10.1159/000065122|pmid=12145487|isbn=9783805574617|s2cid=35857872|url-access=subscription}}</ref>  
The various ICD editions include sections that classify mental and behavioural disorders. The ''ICD-10 Classification of Mental and Behavioural Disorders: Clinical Descriptions and Diagnostic Guidelines'' – also known as the "blue book" – is derived from Chapter {{rn|V}} of ICD-10 and gives the diagnostic criteria for the conditions listed at each [[Diagnosis code|category]] therein. The blue book was developed separately to, but coexists with, the [[Diagnostic and Statistical Manual of Mental Disorders]] (DSM) of the [[American Psychiatric Association]]—though both seek to use the same diagnostic [[Nosology#Types of classification|classifications]]. A survey of psychiatrists in 66 countries comparing use of the ICD-10 and DSM-IV found that the former was more often used for clinical diagnosis while the latter was more valued for research.<ref>{{cite journal|last=Juan E. Mezzich|year=2002|title=International Surveys on the Use of ICD-10 and Related Diagnostic Systems|url=https://books.google.com/books?id=EE-YRUki3LEC&pg=PA72|format=guest editorial, abstract|journal=Psychopathology|volume=35|issue=2–3|pages=72–75|doi=10.1159/000065122|pmid=12145487|isbn=978-3-8055-7461-7|s2cid=35857872|url-access=subscription}}</ref>  


As part of the development of the ICD-11, WHO established an "International Advisory Group" to guide what would become the chapter on "Mental, behavioural or neurodevelopmental disorders".<ref name="Cochran-2014">{{cite journal|title = Proposed declassification of disease categories related to sexual orientation in the ''International Statistical Classification of Diseases and Related Health Problems'' (ICD-11)|first1 = Susan D.|last1 = Cochran|first2 = Jack|last2 = Drescher|author-link2 = Jack Drescher|first3 = Eszter|last3 = Kismödi|first4 = Alain|last4 = Giami|first5 = Claudia|last5 = García-Moreno|first6 = Elham|last6 = Atalla|first7 = Adele|last7 = Marais|first8 = Elisabeth|last8 = Meloni Vieira|first9 = Geoffrey M.|last9 = Reed|journal = [[Bulletin of the World Health Organization]]|year = 2014|volume = 92|issue = 9|pages = 672–679|doi = 10.2471/BLT.14.135541|pmid = 25378758|pmc = 4208576}}</ref><ref>{{cite web |title=ICD-11 for Mortality and Morbidity Statistics {{!}} Chapter 06 Mental, behavioural or neurodevelopmental disorders |url=https://icd.who.int/browse11/l-m/en#/http%3a%2f%2fid.who.int%2ficd%2fentity%2f334423054 |website=icd.who.int |access-date=14 September 2023}}</ref> The working group proposed that ICD-11 should declassify the categories within ICD-10 at "F66 Psychological and behavioural disorders that are associated with sexual development and orientation".<ref name="Cochran-2014" /><ref>{{cite web |title=ICD-10 Version:2019 |url=https://icd.who.int/browse10/2019/en#/F66.2 |website=icd.who.int |access-date=14 September 2023}}</ref> The group reported to WHO that there was "no evidence" these classifications were clinically useful, as they do not "contribute to health service delivery or treatment selection nor provide essential information for public health surveillance."<ref name="Cochran-2014" /> Adding that; despite ICD-10 explicitly stating "sexual orientation by itself is not to be considered a disorder", the inclusion of such categories "suggest that mental disorders exist that are uniquely linked to sexual orientation and gender expression." A position already recognised by the DSM, as well as other classification systems.  
As part of the development of the ICD-11, WHO established an "International Advisory Group" to guide what would become the chapter on "Mental, behavioural or neurodevelopmental disorders".<ref name="Cochran-2014">{{cite journal|title = Proposed declassification of disease categories related to sexual orientation in the ''International Statistical Classification of Diseases and Related Health Problems'' (ICD-11)|first1 = Susan D.|last1 = Cochran|first2 = Jack|last2 = Drescher|author-link2 = Jack Drescher|first3 = Eszter|last3 = Kismödi|first4 = Alain|last4 = Giami|first5 = Claudia|last5 = García-Moreno|first6 = Elham|last6 = Atalla|first7 = Adele|last7 = Marais|first8 = Elisabeth|last8 = Meloni Vieira|first9 = Geoffrey M.|last9 = Reed|journal = [[Bulletin of the World Health Organization]]|year = 2014|volume = 92|issue = 9|pages = 672–679|doi = 10.2471/BLT.14.135541|pmid = 25378758|pmc = 4208576}}</ref><ref>{{cite web |title=ICD-11 for Mortality and Morbidity Statistics {{!}} Chapter 06 Mental, behavioural or neurodevelopmental disorders |url=https://icd.who.int/browse11/l-m/en#/http%3a%2f%2fid.who.int%2ficd%2fentity%2f334423054 |website=icd.who.int |access-date=14 September 2023}}</ref> The working group proposed that ICD-11 should declassify the categories within ICD-10 at "F66 Psychological and behavioural disorders that are associated with sexual development and orientation".<ref name="Cochran-2014" /><ref>{{cite web |title=ICD-10 Version:2019 |url=https://icd.who.int/browse10/2019/en#/F66.2 |website=icd.who.int |access-date=14 September 2023}}</ref> The group reported to WHO that there was "no evidence" these classifications were clinically useful, as they do not "contribute to health service delivery or treatment selection nor provide essential information for public health surveillance."<ref name="Cochran-2014" /> Adding that; despite ICD-10 explicitly stating "sexual orientation by itself is not to be considered a disorder", the inclusion of such categories "suggest that mental disorders exist that are uniquely linked to sexual orientation and gender expression." A position already recognised by the DSM, as well as other classification systems.