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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Neoplasms Of Uncertain Behavior 235-238 > Neoplasm Of Uncertain Behavior Of Other And Unspecified Sites And Tissues 238.* > 2007 ICD-9-CM Diagnosis 238.5 Neoplasm of uncertain behavior of histiocytic and mast cells This code may be outdated. View the most recent version of ICD-9-CM 238.5 A nodule of mast cells. Mastocytomas can involve the skin, subcutaneous tissue, and sometimes muscle. Also called a mast cell tumor. A solid tumor consisting of a dense infiltration of MAST CELLS. It is generally benign. 238.5 is a specific code that can be used to specify a diagnosis 238.5 contains 3 index entries View the ICD-9-CM Volume 1 238.* hierarchy 238.5 also known as: Mast cell tumor NOS Mastocytoma NOS Index entries containing 238.5: Mast cell tumor (M9740/1) 238.5 malignant (M9740/3) 202.6 Mastocytoma (M9740/1) 238.5 malignant (M9740/3) 202.6 Tumor (M8000/1) - see also Neoplasm, by site, unspecified nature mast cell (M9740/1) 238.5 malignant (M9740/3) 202.6