2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Malignant Neoplasm Of Digestive Organs And Peritoneum 150-159 > Malignant Neoplasm Of Other And Ill-Defined Sites Within The Digestive Organs And Peritoneum 159.* > 2006 ICD-9-CM Diagnosis 159.9 Malignant neoplasm of ill-defined sites within the digestive organs and peritoneum View the most recent version of ICD-9-CM 159.9 A primary or metastatic malignant tumor involving any part of the gastrointestinal tract. -- 2003 159.9 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 159.* hierarchy Alternate Terminology Alimentary canal or tract NOS Gastrointestinal tract NOS 159.9 Excludes abdominal NOS (195.2) intra-abdominal NOS (195.2)