International Classification of Diseases (ICD) codes are found on patient paperwork, including hospital records, medical charts, and insurance healthcare bills. They can be used for epidemiology reasons by collating data from healthcare systems.
The ICD receives annual updates in between revisions, which is sometimes reflected in the code title. For example, the 2020 updated version is the ICD-10-CM. The ICD-11 was approved by the WHO in 2019 and goes into effect in 2022