http://terminology.hl7.org/CodeSystem/ICD-9DualCoding|2.0.1

ICD-9 Dual Coding

ICD-9 Dual Coding Expression Syntax\", description: ICD-9 allows dual coding. Refer to Section ?? of the ICD-9 Instruction Manual (ref?).\r\n\r\nThis OID identifies the code system that describes how to encode Dual Coding in a CD compatible expression (for Datatypes R2 CD only).\r\n\r\nAn ICD-9 dual code expression SHALL consist of two ICD-9 codes separated by space. This code system SHALL NOT be used for single ICD-9 codes; the normal ICD-9 code system oid which is 2.16.840.1.113883.6.3 should be used in this case. DisplayName SHALL not be used.\r\n\r\nDual code expressions SHALL only be used per the rules described in the ICD-9 instruction manual.\r\n\r\n**An example CD:**\r\n\r\n```\r\n<example code=\"989.5 E905.9\" codeSystem=\"2.16.840.1.113883.6.260\">\r\n <originalText value=\"ANAPHYLAXIS DUE TO BITE OR STING\"/>\r\n</example>\r\n```\r\nWhere:\r\n* 989.5 is: \"Toxic effect of venom\"\r\n* E905.9 is: \"Bite or sting\"