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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Endocrine, Nutritional And Metabolic Diseases, And Immunity Disorders 240-279 > Diseases Of Other Endocrine Glands 250-259 > Diseases Of Thymus Gland 254.* > 2007 ICD-9-CM Diagnosis 254.9 Unspecified disease of thymus gland  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 Therefore, this code may be out of date.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 254.9 can be accessed here. 254.9 is a specific code that can be used to specify a diagnosis 254.9 contains 2 index entries View the ICD-9-CM Volume 1 254.* hierarchy Index entries containing 254.9: Disease, diseased - see also Syndrome thymus (gland) 254.9 specified NEC 254.8 Dysfunction thymus 254.9