Response to Precision on the Scope on the Combined Comorbidity Index Published in: Validation of the Combined Comorbidity Index of Charlson and Elixhauser to Predict 30-Day Mortality Across ICD-9 and ICD-10

^*Quebec National Institute of Public Health

^†Department of Social and Preventive Medicine, Faculty of Medicine, Laval University

^‡Centre of Excellence on Agin of Quebec Integreted University Health and Social Services Centres of the Capitale-Nationale

^§National Institute of Excellence in Health and Social Services, Québec, QC, Canada

The authors declare no conflict of interest.