Trace numbers assigned at the subscriber level are intended to allow tracing of an eligibility/benefit transaction when the subscriber is the patient. The information receiver may assign one TRN segment in this loop if the subscriber is the patient. A clearinghouse may assign one TRN segment in this loop if the subscriber is the patient
| Loop | Seg ID | Segment Name | Format | Length | Ref# | Req | Value |
| Header | TRN | Subscriber Trace Number | ID | 3 | R | TRN | |
| Element Separator | AN | 1 | * | ||||
| TRN01 | Trace Type Code | ID | 1 | 481 | R | 1 = Current Transaction Trace Number | |
| Element Separator | AN | 1 | * | ||||
| TRN02 | Reference Identification | AN | 1/50 | 127 | R | <Trace Number: Assigned by information receiver or information receiver’s clearing house> | |
| Element Separator | AN | 1 | * | ||||
| TRN03 | Originating Company Identifier | AN | 10 | 509 | R | <ID Number of the company that assigned the trace number> | |
| Segment Terminator | ~ | ||||||
TRN*1*290811021*3030240928~
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