2006 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.* > 2006 ICD-9-CM Diagnosis 165.9 Malignant neoplasm of ill-defined sites within the respiratory system View the most recent version of ICD-9-CM 165.9 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 Alternate Terminology Respiratory tract NOS 165.9 Excludes intrathoracic NOS (195.1) thoracic NOS (195.1)