 The study examined the positive predictive value, PPV, of International Classification of Diseases, Tenth Revision, ICD-10, Diagnostic Coding in the Danish National Registry of Patients, NRP, for 19 Charlesson conditions and found that the overall PPV was 98% with a range from 82.0% to 100%. This article was authored by Lash Timothy L, Christensen Stefan, Christians in Christian F, and others.