ISO 20022 · Organisation identification

CUSTCustomer Number

Registered in sourceSource release: August 2026 (v3)

Published definition

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

Code set and usage

Organisation identification contains 15 registered codes. Its exact identifier is ExternalOrganisationIdentification1Code.

Specifies the external organisation identification scheme name code in the format of character string with a maximum length of 4 characters. The list of valid codes is an external code list published separately. External code sets can be downloaded from www.iso20022.org.

Use the code with the applicable message version and implementation guide. A matching code value alone does not establish the same meaning in another set.

View 751 published message references

This code in other sets 16

These share the characters CUST. Their meanings belong to their respective sets.