2006 ICD-9-CM Volume 1 Diagnosis Codes > Neoplasms 140-239 > Neoplasms Of Uncertain Behavior 235-238 > 235 Neoplasm of uncertain behavior of digestive and respiratory systems 236 Neoplasm of uncertain behavior of genitourinary organs 237 Neoplasm of uncertain behavior of endocrine glands and nervous system 238 Neoplasm of uncertain behavior of other and unspecified sites and tissues