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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 164.1 Malignant neoplasm of heart  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 Therefore, this code may be out of date.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 164.1 can be accessed here. Malignant neoplasms originating in the heart 164.1 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 164.* hierarchy 164.1 also known as: Endocardium Epicardium Myocardium Pericardium 164.1 excludes: great vessels (171.4)