	Ref	Id	Element Name	Req	Type	Min/Max	Usage
	TRN01	481	Trace Type Code Description: Code identifying which transaction is being referenced	M	ID	1/2	Required

Code

Name

Current Transaction Trace Numbers

The term “Current Transaction Trace Numbers” refers to trace or reference numbers assigned by the creator of the 271 transaction (the information source).
If a clearinghouse has assigned a TRN segment and intends on returning their TRN segment in the 271 response to the information receiver, they must
convert the value in TRN01 to “1" (since it will be returned by the information source as a ”2").

Referenced Transaction Trace Numbers

The term “Referenced Transaction Trace Numbers” refers to trace or reference numbers originally sent in the 270 transaction and now returned in the 271.

TRN02	127	Reference Identification Description: Reference information as defined for a particular Transaction Set or as specified by the Reference Identification Qualifier Industry: Trace Number	M	AN	1/30	Required
TRN03	509	Originating Company Identifier Description: A unique identifier designating the company initiating the funds transfer instructions. The first character is one-digit ANSI identification code designation (ICD) followed by the nine-digit identification number which may be an IRS employer identification number (EIN), data universal numbering system (DUNS), or a user assigned number; the ICD for an EIN is 1, DUNS is 3, user assigned number is 9 Industry: Trace Assigning Entity Identifier If TRN01 is “2", this is the value received in the original 270 transaction. If TRN01 is “1", use this information to identify the organization that assigned this trace number. The first position must be either a “1" if an EIN is used, a ”3" if a DUNS is used or a “9" if a user assigned identifier is used.	O	AN	10/10	Required
TRN04	127	Reference Identification Description: Reference information as defined for a particular Transaction Set or as specified by the Reference Identification Qualifier Industry: Trace Assigning Entity Additional Identifier If TRN01 is “2", this is the value received in the original 270 transaction. If TRN01 is “1", use this information if necessary to further identify a specific component, such as a specific division or group of the entity identified in the previous data element (TRN03).	O	AN	1/30	Situational

Notes:

1. Use this segment to convey a unique trace or reference number. See Section 1.3.6 Information Linkage for additional information.
2. An information source may receive up to two TRN segments in each loop 2000D of a 270 transaction and must return each of them in loop 2000D of the 271 transaction with a value of “2" in TRN01.
3. An information source may add one TRN segment to loop 2000D with a value of “1" in TRN01 and must identify themselves in TRN03.
4. If this transaction passes through a clearinghouse, the clearinghouse will receive from the information source the information receiver’s TRN segment and the clearinghouse’s TRN segment with a value of “2" in TRN01. Since the ultimate destination of the transaction is the information receiver, if the clearinghouse intends on passing their TRN segment to the information receiver, the clearinghouse must change the value in TRN01 to ”1" of their TRN segment. This must be done since the trace number in the clearinghouse’s TRN segment is not actually a referenced transaction trace number to the information receiver.

Example:

TRN*2*98175-012547*9877281234*RADIOLOGY~
TRN*2*109834652831*9XYZCLEARH*REALTIME~
TRN*1*209991094361*9ABCINSURE~
The above example represents how an information source would respond. The first TRN segment was initiated by the information receiver. The second TRN segment was initiated by the clearinghouse. The third TRN segment was initiated by the information source.
TRN*2*98175-012547*9877281234*RADIOLOGY~
TRN*1*109834652831*9XYZCLEARH*REALTIME~
TRN*1*209991094361*9ABCINSURE~
The above example represents how a clearinghouse would respond to the same set of TRN segments if the clearinghouse intends to pass their TRN segment on to the information receiver. If the clearinghouse does not intend to pass their TRN segment on to the information receiver, only the first and third TRN segments in the example would be sent.

1.	TRN02 provides unique identification for the transaction.
2.	TRN03 identifies an organization.
3.	TRN04 identifies a further subdivision within the organization.