ANSI X 12 -- EDI Format

Segment Types
ISA Interchange Control Header
GS Function Group Header
ST Transaction Set Header
SE Transaction Set Trailer
GE Function Group Trailer
IEA Interchange Control Trailer
Segment Formats

Segment Formats
ISA*fields^
GS*fields^
ST*fields^
SE*fields^
GE*fields^
IEA*fields^

Note: * = Field Separator; ^ = Segment Separator

Segment Fields

ISA Segment
ISA01 Authorization Information Qualifier
ISA02 Authorization Information
ISA03 Security Information Qualifier
ISA04 Security Information
ISA05 Interchange ID Qualifier
ISA06 Interchange Sender ID
ISA07 Interchange ID Qualifier
ISA08 Interchange Receiver ID
ISA09 Interchange Date
ISA10 Interchange Time
ISA11 Interchange Control Standards ID
ISA12 Interchange Control Version Number
ISA13 Interchange Control Number
ISA14 Acknowledgement Requested
ISA15 Test Indicator
ISA16 Subelement Separator


GS Segment
ISA*fields^
GS01 Functional ID code
GS02 Application Sender's Code
GS03 Application Receiver's Code
GS04 Date
GS05 Time
GS06 Group Control Number
GS07 Responsible Agency Code
GS08 Version/Rel. Ind. ID Code

ST Segment
ST01 Transaction set ID code
ST02 Transaction set control number

SE Segment
SE01 Number of included segments
SE02 Transaction set control number (same as ST02)

GE Segment
GE01 Number of Transaction Sets Included in this Function Group
GE02 Group Control Number (same as GS06)

IEA Segment
IEA01 Number of Included Functional Groups
IEA02 Interchange Control Number (same as ISA13)