D921

BEGINNING OF MESSAGE

To indicate the type and function of a message and to transmit the identifying number.

Segment structure

C002       DOCUMENT/MESSAGE NAME                              C
   1001    Document/message name, coded                       C   an1..3
   1131    Code list qualifier                                C   an1..3
   3055    Code list responsible agency, coded                C   an1..3
   1000    Document/message name                              C   an1..35
1004       DOCUMENT/MESSAGE NUMBER                            C   an1..35
1225       MESSAGE FUNCTION, CODED                            C   an1..3
4343       RESPONSE TYPE, CODED                               C   an1..3