The 745.5 issue in code-based, adult congenital heart disease population studies: Relevance to current and future ICD-9-CM and ICD-10-CM studies.

This validation study demonstrates that 745.5 performed poorly across all ages. As 745.5 is widely used in population-level investigations and ICD-10-CM perpetuates the problem, future analyses utilizing CHD codes should consider separate analysis of those identified only through code 745.5.