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ExternalOrganisationIdentification1Code

CUST Code: Customer Number

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CUST means customer number in the ISO 20022 organisation identification code set. Number assigned by an issuer to identify a customer.

Code
CUST
ISO name
CustomerNumber
Status
Registered
Last updated
2009-04-01

Official definition

Number assigned by an issuer to identify a customer.

Number assigned by a party to identify a creditor or debtor relationship.

Definition from the ISO 20022 External Code Sets, 2Q2026 (published 28 Aug 2026).

Messages and fields that use ExternalOrganisationIdentification1Code

MessageElement path
pacs.002TxInfAndSts/StsRsnInf/Orgtr/Id/OrgId/Othr/SchmeNm/Cd, OrgnlGrpInfAndSts/StsRsnInf/Orgtr/Id/OrgId/Othr/SchmeNm/Cd, TxInfAndSts/OrgnlTxRef/CdtrSchmeId/Id/OrgId/Othr/SchmeNm/Cd, TxInfAndSts/OrgnlTxRef/Dbtr/Pty/Id/OrgId/Othr/SchmeNm/Cd
pain.002GrpHdr/InitgPty/Id/OrgId/Othr/SchmeNm/Cd, OrgnlGrpInfAndSts/StsRsnInf/Orgtr/Id/OrgId/Othr/SchmeNm/Cd, OrgnlPmtInfAndSts/StsRsnInf/Orgtr/Id/OrgId/Othr/SchmeNm/Cd, OrgnlPmtInfAndSts/TxInfAndSts/StsRsnInf/Orgtr/Id/OrgId/Othr/SchmeNm/Cd
pacs.004TxInf/RtrRsnInf/Orgtr/Id/OrgId/Othr/SchmeNm/Cd, OrgnlGrpInf/RtrRsnInf/Orgtr/Id/OrgId/Othr/SchmeNm/Cd, TxInf/OrgnlTxRef/CdtrSchmeId/Id/OrgId/Othr/SchmeNm/Cd, TxInf/RtrChain/Dbtr/Pty/Id/OrgId/Othr/SchmeNm/Cd
camt.056Case/Cretr/Pty/Id/OrgId/Othr/SchmeNm/Cd, Assgnmt/Assgnr/Pty/Id/OrgId/Othr/SchmeNm/Cd, Assgnmt/Assgne/Pty/Id/OrgId/Othr/SchmeNm/Cd, Undrlyg/TxInf/CxlRsnInf/Orgtr/Id/OrgId/Othr/SchmeNm/Cd
camt.029Assgnmt/Assgnr/Pty/Id/OrgId/Othr/SchmeNm/Cd, Assgnmt/Assgne/Pty/Id/OrgId/Othr/SchmeNm/Cd, ModDtls/Assgnr/Pty/Id/OrgId/Othr/SchmeNm/Cd, ModDtls/Assgne/Pty/Id/OrgId/Othr/SchmeNm/Cd
pacs.008CdtTrfTxInf/Dbtr/Id/OrgId/Othr/SchmeNm/Cd, CdtTrfTxInf/Cdtr/Id/OrgId/Othr/SchmeNm/Cd, CdtTrfTxInf/InitgPty/Id/OrgId/Othr/SchmeNm/Cd, CdtTrfTxInf/UltmtDbtr/Id/OrgId/Othr/SchmeNm/Cd
pacs.009CdtTrfTxInf/UndrlygCstmrCdtTrf/Dbtr/Id/OrgId/Othr/SchmeNm/Cd, CdtTrfTxInf/UndrlygCstmrCdtTrf/Cdtr/Id/OrgId/Othr/SchmeNm/Cd, CdtTrfTxInf/UndrlygCstmrCdtTrf/InitgPty/Id/OrgId/Othr/SchmeNm/Cd, CdtTrfTxInf/UndrlygCstmrCdtTrf/UltmtDbtr/Id/OrgId/Othr/SchmeNm/Cd
pain.001PmtInf/Dbtr/Id/OrgId/Othr/SchmeNm/Cd, GrpHdr/InitgPty/Id/OrgId/Othr/SchmeNm/Cd, PmtInf/UltmtDbtr/Id/OrgId/Othr/SchmeNm/Cd, PmtInf/CdtTrfTxInf/Cdtr/Id/OrgId/Othr/SchmeNm/Cd

And 175 more messages: see the ExternalOrganisationIdentification1Code page.

CUST in other code sets

CUST questions

What does CUST mean in ISO 20022?
CUST is Customer Number in the ExternalOrganisationIdentification1Code code set: Number assigned by an issuer to identify a customer. Number assigned by a party to identify a creditor or debtor relationship.
Where does CUST appear in a message?
For example in camt.056, element Case/Cretr/Pty/Id/OrgId/Othr/SchmeNm/Cd.

All ExternalOrganisationIdentification1Code codes · ISO 20022 code sets

The ISO 20022 code names and definitions on this page are reproduced from material published at iso20022.org under the ISO 20022 Intellectual Property Rights policy. This is not the official source: the up-to-date ISO 20022 standards and repository material are published only at iso20022.org. Explanations in our own words are by ZagTrader. ZagTrader is not affiliated with or endorsed by ISO or Swift.