Final answer:
The World Health Organization (WHO) established the ICD codes which are used for classifying diseases and monitoring health trends in clinical fields.
Step-by-step explanation:
The organization that established the International Classification of Diseases (ICD) codes is the World Health Organization (WHO). These codes are critical in the clinical field for classifying diseases and for the monitoring of morbidity and mortality related to various health conditions. Two locations where you would likely find an ICD code are a medical laboratory, where the codes identify tests to be performed, and in the health-care management system, where they verify appropriate treatments and laboratory work.