MEDPRE
Medical prescription message

UNH M Message header

BGM M Beginning of message

DTM C Date/time/period

FTX C Free text

SG1 M
SEQ
PNA
IDE
...

SG3 C
ATT
PNA
PDI
...

SG9 M
GEI
IDE
DTM
...

CNT C Control total

UNT M Message trailer