This code system http://hl7.org/fhir/v2/0516 defines the following codes:

CodeDisplayComments
EErrorTransaction was unsuccessful
FFatal ErrorMessage not processed due to application or network failure condition
IInformationTransaction was successful but includes information e.g. inform patient
WWarningTransaction successful, but there may issues

Additional Language Displays

Codede
EFehler
F
IInformation
WWarnung