2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Malignant Neoplasm Of Lymphatic And Hematopoietic Tissue 200-208 > Other Malignant Neoplasms Of Lymphoid And Histiocytic Tissue 202.* > 2006 ICD-9-CM Diagnosis 202.6 Malignant mast cell tumors View the most recent version of ICD-9-CM 202.6 A group of disorders caused by the abnormal proliferation of MAST CELLS in a variety of extracutaneous tissues including bone marrow, liver, spleen, lymph nodes, and gastrointestinal tract. Systemic mastocytosis is commonly seen in adults. These diseases are categorized on the basis of clinical features, pathologic findings, and prognosis. A variant of mastocytosis characterized by multifocal, dense infiltrates of mast cells (15 or more mast cells in aggregates) detected in the bone marrow and/or other extracutaneous sites. (WHO, 2001) -- 2003 A rare entity characterized by localized but destructive growth of a tumor consisting of highly atypical, immature mast cells.(WHO, 2001) -- 2003 A unifocal malignant tumor that consists of atypical pathological MAST CELLS without systemic involvement. It causes local destructive growth in organs other than in skin or bone marrow. 202.6 is a non-specific code that cannot be used to specify a diagnosis 202.6 contains 10 index entries View the ICD-9-CM Volume 1 202.* hierarchy Alternate Terminology Malignant: mastocytoma mastocytosis Mast cell sarcoma Systemic tissue mast cell disease 202.6 Excludes mast cell leukemia (207.8)  Index entries containing 202.6: Disease, diseased - see also Syndrome mast cell 757.33 systemic (M9741/3) 202.6 systemic tissue mast cell (M9741/3) 202.6 Mast cell disease 757.33 systemic (M9741/3) 202.6 sarcoma (M9742/3) 202.6 tumor (M9740/1) 238.5 malignant (M9740/3) 202.6 Mastocytoma (M9740/1) 238.5 malignant (M9740/3) 202.6 Mastocytosis 757.33 malignant (M9741/3) 202.6 systemic (M9741/3) 202.6 Sarcoma (M8800/3) - see also Neoplasm, connective tissue, malignant mast cell (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