Changes in the 11th revision of the International Classification of Diseases (ICD-11) from ICD-10 may significantly impact coding quality. We conducted a field trial in 2017 to evaluate the line coding quality of 19 cases coded using the coding method of the World Health Organization. The cases with low agreement between the accuracy rates of ICD-10 and ICD-11 were cases that required the extension code. We should prepare effective educational content about how to use the extension code for proper coding in ICD-11.
Keywords: Clinical Coding; International Classification of Diseases; World Health Organization.