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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Endocrine, Nutritional And Metabolic Diseases, And Immunity Disorders 240-279 > Other Metabolic Disorders And Immunity Disorders 270-279 > Disorders Involving The Immune Mechanism 279.* > 2008 ICD-9-CM Diagnosis 279.9 Unspecified disorder of immune mechanism  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 279.9 can be accessed here. 279.9 is a specific code that can be used to specify a diagnosis 279.9 contains 2 index entries View the ICD-9-CM Volume 1 279.* hierarchy Index entries containing 279.9: Disease, diseased - see also Syndrome immunologic NEC 279.9 Disorder - see also Disease immune mechanism (immunity) 279.9 single complement (C1-C9) 279.8 specified type NEC 279.8