Definitions for "Adverse events"
A group of conditions included in the ICD-9 chapter on External Causes of Injury and Poisoning. ICD-9 codes Description E870-E876 Misadventures to patients during medical and surgical care. E878-E879 Surgical and medical procedures as the cause of abnormal reaction of patient or later complication, without mention of misadventure at time of procedure. E930-E949 Drugs, medicinal and biological substances causing adverse effects in therapeutic use. These conditions differ from most injuries, both in their nature and in the types of measures that might be considered appropriate to prevent them. They are excluded from the counts of injuries on this web site.
Unfavorable and unintended signs, symptoms, disease or event that occurs while taking a medication which may or may not be related to the medication
A medical complaint, change, or possible side effect of any degree of severity, that may or may not be attributed to the investigational product.
undesirable experiences occurring after immunization that may or may not be related to the vaccine.