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Reference
Technical reference documentation for healthcare EDI concepts. Use this section when you need to look up specific details about EDI structures, segments, or codes.
In This Section
Loop Hierarchy
Understanding EDI loop structures — how transactions are organized into hierarchical loops, with detailed breakdowns for 837, 835, 270, 271, and 277CA transaction types.
Segment Reference
Common EDI segments explained — segment structure (elements, composites), key segments by transaction type, and how to read segment data in EDI Paisan.
Qualifier Codes
Common qualifier codes and their meanings, including entity identifiers, service type codes, adjustment reason codes (CARCs), and benefit information codes.
Quick Links
| Need to... | Go to... |
|---|---|
| Understand loop nesting | Loop Hierarchy |
| Look up a segment | Segment Reference |
| Find a qualifier code meaning | Qualifier Codes |
| Learn about a file type | File Types |
External Resources
For official X12 standards and implementation guides:
- X12.org — Official X12 standards body
- WEDI — Workgroup for Electronic Data Interchange
- CMS.gov — CMS Transaction resources
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