2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Malignant Neoplasm Of Respiratory And Intrathoracic Organs 160-165 > Malignant Neoplasm Of Thymus Heart And Mediastinum 164.* > 2006 ICD-9-CM Diagnosis 164.0 Malignant neoplasm of thymus View the most recent version of ICD-9-CM 164.0 Primary or metastatic malignant neoplasm involving the thymus. This category includes malignant thymomas, thymic lymphomas, primary thymic carcinomas, and metastatic carcinomas from other anatomic sites. --2003 164.0 is a specific code that can be used to specify a diagnosis 164.0 contains 2 index entries View the ICD-9-CM Volume 1 164.* hierarchy  Index entries containing 164.0: Carcinoma (M8010/3) - see also Neoplasm, by site, malignant thymic (M8580/3) 164.0 Thymoma (benign) (M8580/0) 212.6 malignant (M8580/3) 164.0