Coding Algorithms for Defining Comorbidities in ICD-9-CM and ICD-10 Administrative Data

Implementation of the International Statistical Classification of Disease and Related Health Problems, 10th Revision (ICD-10) coding system presents challenges for using administrative data. Recognizing this, we conducted a multistep process to develop ICD-10 coding algorithms to define Charlson and Elixhauser comorbidities in administrative data and assess the performance of the resulting algorithms.ICD-10 coding algorithms were developed by...