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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 Other And Ill-Defined Sites Within The Respiratory System And Intrathoracic Organs 165.* > 2008 ICD-9-CM Diagnosis 165.9 Malignant neoplasm of ill-defined sites within the respiratory system  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 Therefore, this code may be out of date.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 165.9 can be accessed here. Malignant neoplasms originating in the respiratory tract 165.9 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 165.* hierarchy 165.9 also known as: Respiratory tract NOS 165.9 excludes: intrathoracic NOS (195.1) thoracic NOS (195.1)