82752-7 is "Date travel started". 91560-3, which is the LOINC that departureDate is currently mapped to, is the date of departure from the destination, i.e., the date the person left to come home.
Looking at the case report form, this variable represents the date of departure from the destination, so the existing mapping is correct. Closing this issue.
82752-7 is "Date travel started". 91560-3, which is the LOINC that departureDate is currently mapped to, is the date of departure from the destination, i.e., the date the person left to come home.