US · guidance
CMS Pub. 100-04, ch. 24, § 50.7
Delimiters
Delimiters - Inbound Transactions
As detailed in the HIPAA adopted ASC X12 implementation guides, delimiters are
determined by the characters sent in specified, set positions of the ISA header. For
transmissions to Medicare (inbound transmissions), these charters are determined by the
submitter and can be any characters which are not contained within any data elements
within the ISA/IEA Interchange Envelope. Please note, that the delimiters for NCPDP
files are dictated by the transaction standard.
Delimiters - Outbound Transactions
Medicare will use the following delimiters in all outbound ASC X12 transactions. Note
that these characters will not be used in data elements within an ISA/IEA Interchange
Envelope.
Delimiter Character
Used
Dec
Value
Hex
Value
Data
Element
Separator
* 62 3E
Repetition
Separator
^ 94 5E
Component
Element
Separator
: 43 2B
Segment
Terminator
~ 126 7E
History
(Rev. 2803, Issued: 10-28-13, Effective: 09-17-13, Implementation: 09-17-13)
Provenance
- Source
- cms.gov
- Retrieved
- 2026-08-25
- Edition
- iom-2026-08-25
- Content hash
89feac4f465e43d8da5e7816cab65e4ce3d40016d6b401efa38c44ae050ea162
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