ICD-10, the International Classification of Diseases, 10th Revision, is a globally recognized system for coding diseases, symptoms, abnormal findings, and mortality. Developed by the World Health Organization (WHO), ICD-10 standardizes health condition reporting and enables better tracking of global disease and mortality statistics. In the U.S., a modified version called ICD-10-CM is used for diagnosis coding, and ICD-10-PCS for inpatient procedure coding. Notably, there is often a significant delay in the U.S. adoption of each ICD revision; ICD-10, endorsed by WHO in 1990, was only adopted by the U.S. in 2015. While WHO has already released ICD-11, it may still be some time before it is adopted in the U.S., highlighting variable adoption timelines across countries.