Comorbidity adjustment index for the international classification of diseases, 10th revision.

Objective: To develop a Charlson-like comorbidity index based on clinical conditions and weights of the original Charlson comorbidity index.

Methods: Clinical conditions and weights were adapted from the International Classification of Diseases, 10th revision and applied to a single hospital admission diagnosis. The study included 3,733 patients over 18 years of age who were admitted to a public general hospital in the city of Rio de Janeiro, southeast Brazil, between Jan 2001 and Jan 2003.