Reserved ICD value
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Interchanging partners may want, by prior agreement, to interchange organization identifiers allocated by an identification scheme to which an ICD value has been assigned, or for which the assignment of an ICD value is pending. The range of ICD values between 9900 and 9999 is reserved for that effect. The interchange partners shall agree on the identification of the identification scheme, using one of the above reserved values.
For more information, see ISO/IEC 6523-1, clause 5.