BACKGROUND:Patients with comorbidities do not receive optimal treatment for their cancer. leading to lower cancer survival. Information on individual comorbidities is not straightforward to derive from population-based administrative health datasets. We described the development of a reproducible algorithm to extract the individual Charlson index comorbidities from such data. https://www.spidertattooz.com/Made-Goods-Jarin-Faux-Belgian-Linen-Dresser/