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2008 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.* > 2008 ICD-9-CM Diagnosis 164.8 Malignant neoplasm of other parts of mediastinum  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 Therefore, this code may be out of date.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 164.8 can be accessed here. 164.8 is a specific code that can be used to specify a diagnosis 164.8 contains 3 index entries View the ICD-9-CM Volume 1 164.* hierarchy 164.8 also known as: Malignant neoplasm of contiguous or overlapping sites of thymus, heart, and mediastinum whose point of origin cannot be determined Index entries containing 164.8: Neoplasm, neoplastic 199.1 199.1 234.9 229.9 238.9 239.9 heart 164.1 198.89 - 212.7 238.8 239.8 contiguous sites with mediastinum or thymus 164.8 - - - - - mediastinum, mediastinal 164.9 197.1 - 212.5 235.8 239.8 contiguous sites with heart and thymus 164.8 - - - - - thymus (gland) 164.0 198.89 - 212.6 235.8 239.8 contiguous sites with heart and mediastinum 164.8 - - - - -