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 > ICD-9-CM Diagnosis 254 Diseases of thymus gland 254 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 254.0 Persistent hyperplasia of thymus Enlargement of the thymus. A condition described in the late 1940's and 1950's as pathological thymic hypertrophy was status thymolymphaticus and was treated with radiotherapy. Unnecessary removal of the thymus was also practiced. It later became apparent that the thymus undergoes normal physiological hypertrophy, reaching a maximum at puberty and involuting thereafter. The concept of status thymolymphaticus has been abandoned. Thymus hyperplasia is present in two thirds of all patients with myasthenia gravis. 254.0 is a specific code that can be used to specify a diagnosis 254.0 contains 4 index entries ICD-9-CM Diagnosis 254.1 Abscess of thymus 254.1 is a specific code that can be used to specify a diagnosis 254.1 contains 2 index entries ICD-9-CM Diagnosis 254.8 Other specified diseases of thymus gland 254.8 is a specific code that can be used to specify a diagnosis 254.8 contains 26 index entries ICD-9-CM Diagnosis 254.9 Unspecified disease of thymus gland 254.9 is a specific code that can be used to specify a diagnosis 254.9 contains 2 index entries