The UB1 segment contains data specific to the United States; other realms may choose to implement using regional code sets. Only billing/claims fields that do not exist in other HL7 defined segments appear in this segment. The codes listed as examples are not an exhaustive or current list.

Prior to V2.6, this segment was published as a UB-82 specific segment, but has been widely implemented for usage with UB-82 and/or UB-92 data. With the publication of the UB-92 (in 1992) and the HIPAA requirements in the US (2004), this segment is technically no longer applicable for the UB-82 which is no longer in use. However, the segment is often used internally to message data from a patient registration to a patient accounting system. It has been 'generalized' in V2.6 for wider applicability.

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C.LenElementv2.5
1..4-SIO1-00530UB1-1Set ID - UB1
2---W1-00531UB1-2Blood Deductible4
3..2-NMO1-00532UB1-3Blood Furnished-PintsName
4..2-NMO1-00533UB1-4Blood Replaced-PintsName
5..2-NMO1-00534UB1-5Blood Not Replaced-PintsName
6--NMB1-00535UB1-6Co-Insurance Days3
7--ISB5004300536UB1-7Condition Code4
8--NMB1-00537UB1-8Covered Days3
9--NMB1-00538UB1-9Non Covered Days3
10--UVCB8-00539UB1-10Value Amount & Code4
11..2-NMO1-00540UB1-11Number Of Grace DaysName
12..250-CWEO1034800541UB1-12Special Program Indicator2
13..250-CWEO1034900542UB1-13PSRO/UR Approval Indicator2
14..8-DTO1-00543UB1-14PSRO/UR Approved Stay-FmName
15..8-DTO1-00544UB1-15PSRO/UR Approved Stay-ToName
16--OCDB5-00545UB1-16Occurrence4
17--CWEB1035100546UB1-17Occurrence Span4
18--DTB1-00547UB1-18Occur Span Start Date3
19--DTB1-00548UB1-19Occur Span End Date3
20--STB1-00549UB1-20UB-82 Locator 2Length
21--STB1-00550UB1-21UB-82 Locator 9Length
22--STB1-00551UB1-22UB-82 Locator 27Length
23--STB1-00552UB1-23UB-82 Locator 45Length
6