comorbidity

Computing comorbidity indices and scores such as the weighted Charlson score (Charlson, 1987 doi:10.1016/0021-9681(87)90171-8) and the Elixhauser comorbidity score (Elixhauser, 1998 doi:10.1097/00005650-199801000-00004) using ICD-9-CM or ICD-10 codes (Quan, 2005 doi:10.1097/01.mlr.0000182534.19832.83). Australian and Swedish modifications of the Charlson Comorbidity Index are available as well (Sundararajan, 2004 doi:10.1016/j.jclinepi.2004.03.012 and Ludvigsson, 2021 doi:10.2147/CLEP.S282475), together with different weighting algorithms for both the Charlson and Elixhauser comorbidity scores.

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