+/* ------------------------------------------------------------------ */ /* This query extracts Charlson Comorbidity Index (CCI) based on the */ /* recorded ICD-9 and ICD-10 codes. */ /* Reference for CCI: */ /* (1) Charlson ME, Pompei P, Ales KL, MacKenzie CR. (1987) A new method */ /* of classifying prognostic comorbidity in longitudinal studies: */ /* development and validation.J Chronic Dis; 40(5):373-83. */ /* (2) Charlson M, Szatrowski TP, Peterson J, Gold J. (1994) Validation */ /* of a combined comorbidity index. J Clin Epidemiol; 47(11):1245-51. */ /* */ /* Reference for ICD-9-CM and ICD-10 Coding Algorithms for Charlson */ /* Comorbidities: */ /* (3) Quan H, Sundararajan V, Halfon P, et al. Coding algorithms for */ /* defining Comorbidities in ICD-9-CM and ICD-10 administrative data. */ /* Med Care. 2005 Nov; 43(11): 1130-9. */ /* ICD-10-CM extensions (C4A, C7A, C7B) are not part of WHO ICD-10 and */ /* were not defined in Quan et al. (2005). The malignant_cancer mapping */ /* below follows Quan by excluding skin malignancy (C4A Merkel cell) and */ /* by not mapping C7A/C7B neuroendocrine categories, which fall outside */ /* the WHO ICD-10 code ranges used in the publication. */ /* ------------------------------------------------------------------ */
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