| Segment specification | BGM |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To indicate the type and function of a message and to transmit the identifying number. |
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| 010 |
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C002 | Document/message name | C | 1 | |||||||||
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C | 1 | an..3 | |||||||||
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C | 1 | an..17 | |||||||||
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C | 1 | an..3 | |||||||||
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C | 1 | an..35 | |||||||||
| 020 |
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C106 | Document/message identification | C | 1 | |||||||||
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C | 1 | an..35 | |||||||||
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C | 1 | an..9 | |||||||||
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C | 1 | an..6 | |||||||||
| 030 |
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1225 | Message function code | C | 1 | an..3 | |||||||||
| 040 |
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4343 | Response type code | C | 1 | an..3 |
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