AEDECOD is the preferred term derived by the sponsor from the coding dictionary. It is a required variable for SDTM must have a value.
It is expected for OAD and must be filled for all records with AENYN=1 (BHC-example 1).
It is expected that the reported term (AETERM) will be coded using a standard dictionary such as MedDRA.
The sponsor is expected to provide the dictionary name and version used to map the terms utilizing the define.xml external codelist attributes.