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 164.2 Malignant neoplasm of anterior mediastinum View the most recent version of ICD-9-CM 164.2 164.2 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 164.* hierarchy