| Segment specification | CDV |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To provide information related to a code value. |
| 覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧 |
| 010 |
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9426 | Code value | M | 1 | an..35 | |||
| 020 |
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9434 | Code name | C | 1 | an..70 | |||
| 030 |
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4513 | Maintenance operation code | C | 1 | an..3 | |||
| 040 |
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9453 | Code value source code | C | 1 | an..3 | |||
| 050 |
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7299 | Requirement designator code | C | 1 | an..3 |
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