2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Carcinoma In Situ 230-234 > 2006 ICD-9-CM Diagnosis 231 Carcinoma in situ of respiratory system View the most recent version of ICD-9-CM 231 231 is a non-specific code that cannot be used to specify a diagnosis