2006 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 > 2006 ICD-9-CM Diagnosis 254 Diseases of thymus gland View the most recent version of ICD-9-CM 254 254 is a non-specific code that cannot be used to specify a diagnosis 254 Excludes aplasia or dysplasia with immunodeficiency (279.2) hypoplasia with immunodeficiency (279.2) myasthenia gravis (358.00-358.01)