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- Title
A unidirectional mapping of ICD-8 to ICD-10 codes, for harmonized longitudinal analysis of diseases.
- Authors
Pedersen, Mette Krogh; Eriksson, Robert; Reguant, Roc; Collin, Catherine; Pedersen, Helle Krogh; Sørup, Freja Karuna Hemmingsen; Simon, Christian; Birch, Anna Marie; Larsen, Michael; Nielsen, Anna Pors; Belling, Kirstine; Brunak, Søren
- Abstract
Periodic revisions of the international classification of diseases (ICD) ensure that the classification reflects new practices and knowledge; however, this complicates retrospective research as diagnoses are coded in different versions. For longitudinal disease trajectory studies, a crosswalk is an essential tool and a comprehensive mapping between ICD-8 and ICD-10 has until now been lacking. In this study, we map all ICD-8 morbidity codes to ICD-10 in the expanded Danish ICD version. We mapped ICD-8 codes to ICD-10, using a many-to-one system inspired by general equivalence mappings such that each ICD-8 code maps to a single ICD-10 code. Each ICD-8 code was manually and unidirectionally mapped to a single ICD-10 code based on medical setting and context. Each match was assigned a score (1 of 4 levels) reflecting the quality of the match and, if applicable, a "flag" signalling choices made in the mapping. We provide the first complete mapping of the 8596 ICD-8 morbidity codes to ICD-10 codes. All Danish ICD-8 codes representing diseases were mapped and 5106 (59.4%) achieved the highest consistency score. Only 334 (3.9%) of the ICD-8 codes received the lowest mapping consistency score. The mapping provides a scaffold for translation of ICD-8 to ICD-10, which enable longitudinal disease studies back to and 1969 in Denmark and to 1965 internationally with further adaption.
- Subjects
DENMARK; INTERNATIONAL Statistical Classification of Diseases &; Related Health Problems; NOSOLOGY; MEDICAL coding; DISEASE mapping; DATA harmonization
- Publication
European Journal of Epidemiology, 2023, Vol 38, Issue 10, p1043
- ISSN
0393-2990
- Publication type
Article
- DOI
10.1007/s10654-023-01027-y