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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Carcinoma In Situ 230-234 > Carcinoma In Situ Of Respiratory System 231.* > 2008 ICD-9-CM Diagnosis 231.9 Carcinoma in situ of respiratory system part unspecified 231.9 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 231.* hierarchy 231.9 also known as: Respiratory organ NOS