255 Underwriting Information Services (004020)
This is the standard X12 004020 spec, with 8 loops and 55 segment positions, as OpenEDI JSON, an ediFabric C# template and an ediFabric Native model. To change it for a trading partner, customize it in the EDI Spec Builder.
Use the 255 spec in your code
ediFabric .NET
Add the C# template and its common files to your project, or reference the template NuGet package, and read 255 files into TS255 objects. See ediFabric .NET.
ediFabric Native
Map version 004020 to the Native model with set_map, then parse 255 files to JSON from Python, Java, C or C#. See Convert between EDI and JSON.
OpenEDI
Select Customize in Spec Builder to copy the spec under your own name, change it for your partner, and parse files against it in EdiNation, ediFabric Native or ediFabric Cloud. Read about OpenEDI.
Generate 255 classes in Python, Java, Node.js, Go, Rust or C
ediFabric Native returns each 255 as JSON, with the property names of the OpenEDI schema. To work with that JSON as typed objects, generate classes from the OpenEDI file in your language and deserialize the JSON into TS255. Serialize the objects back to JSON to build EDI with ediFabric Native. The classes keep the loops, segments, lengths and code lists, but not the EDI data formats, so validate files with ediFabric Native. Read more in Generate a class from OpenEDI.
Python: datamodel-code-generator. Node.js: openapi-typescript. Java, Go, Rust and C: OpenAPI Generator.
255 structure
Loops and segments of the standard 255, with their usage and maximum repeats.
| ID | Name | Usage | Max use |
|---|---|---|---|
| ST | Transaction Set Header | Optional | 1 |
| BGN | Beginning Segment | Mandatory | 1 |
| CUR | Currency | Optional | 1 |
| Loop NM1 | Individual or Organizational Name | Optional | 9 |
| NM1 | Individual or Organizational Name | Mandatory | 1 |
| N3 | Address Information | Optional | 2 |
| N4 | Geographic Location | Optional | 1 |
| REF | Reference Identification | Optional | 9 |
| PER | Administrative Communications Contact | Optional | 3 |
| Loop ACT | Account Identification | Mandatory | >1 |
| ACT | Account Identification | Mandatory | 1 |
| AM1 | Informational Values | Optional | 9 |
| PWK | Paperwork | Optional | 1 |
| REF | Reference Identification | Optional | >1 |
| PER | Administrative Communications Contact | Optional | 3 |
| DTM | Date/Time Reference | Optional | 9 |
| MSG | Message Text | Optional | 9 |
| YNQ | Yes/No Question | Optional | 15 |
| NTE | Note/Special Instruction | Optional | >1 |
| Loop NM1 | Individual or Organizational Name | Mandatory | >1 |
| NM1 | Individual or Organizational Name | Mandatory | 1 |
| N2 | Additional Name Information | Optional | 3 |
| Loop LX | Assigned Number | Mandatory | >1 |
| LX | Assigned Number | Mandatory | 1 |
| N3 | Address Information | Optional | 3 |
| N4 | Geographic Location | Optional | 1 |
| ASI | Action or Status Indicator | Optional | 1 |
| PER | Administrative Communications Contact | Optional | 3 |
| DMG | Demographic Information | Optional | 1 |
| IND | Additional Individual Demographic Information | Optional | 1 |
| CD2 | Multi-Valued Characteristics | Optional | 9 |
| MSG | Message Text | Optional | 9 |
| Loop EFI | Electronic Format Identification | Optional | >1 |
| EFI | Electronic Format Identification | Mandatory | 1 |
| BIN | Binary Data | Optional | 1 |
| Loop PO1 | Baseline Item Data | Optional | >1 |
| PO1 | Baseline Item Data | Mandatory | 1 |
| ASI | Action or Status Indicator | Optional | 1 |
| DMA | Additional Demographic Information | Optional | 9 |
| REF | Reference Identification | Optional | 9 |
| DTP | Date or Time or Period | Optional | 9 |
| MSG | Message Text | Optional | 9 |
| Loop LS | Loop Header | Optional | 1 |
| LS | Loop Header | Mandatory | 1 |
| Loop LX | Assigned Number | Optional | >1 |
| LX | Assigned Number | Mandatory | 1 |
| NM1 | Individual or Organizational Name | Mandatory | 1 |
| N2 | Additional Name Information | Optional | 3 |
| NX2 | Location ID Component | Optional | >1 |
| N4 | Geographic Location | Optional | 1 |
| REC | Real Estate Condition | Optional | 1 |
| IND | Additional Individual Demographic Information | Optional | 1 |
| EMS | Employment Position | Optional | 1 |
| PER | Administrative Communications Contact | Optional | 3 |
| CN1 | Contract Information | Optional | 1 |
| DTP | Date or Time or Period | Optional | 9 |
| CD2 | Multi-Valued Characteristics | Optional | 9 |
| REF | Reference Identification | Optional | 9 |
| PWK | Paperwork | Optional | 1 |
| MSG | Message Text | Optional | 9 |
| AM1 | Informational Values | Optional | >1 |
| LE | Loop Trailer | Mandatory | 1 |
| SE | Transaction Set Trailer | Optional | 1 |