On October 1, 2015, the medical industry launched ICD-10 in the U.S.  ICD-10, which stands for the International Classification of Diseases, 10th revision, is a medical classification system adopted by the World Health Organization (WHO). Simply put, it’s an international coding system that requires physicians, hospitals and other medical providers to assign a unique number for every patient disease, diagnosis, abnormal finding, cause of injury, etc.