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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 2007 ICD-9-CM Diagnosis 238.6 Neoplasm of uncertain behavior of plasma cells This code may be outdated. View the most recent version of ICD-9-CM 238.6 (PLAS-ma-sye-TOE-ma) Cancer of the plasma cells (white blood cells that produce antibodies) that may turn into multiple myeloma. A malignant (clonal) proliferation of plasma cells that are cytologically and immunophenotypically identical to those of plasma cell myeloma, but manifest a localized osseous or extraosseous growth pattern. (WHO, 2001) -- 2003 Any discrete, presumably solitary, mass of neoplastic plasma cells either in bone marrow or various extramedullary sites. 238.6 is a specific code that can be used to specify a diagnosis 238.6 contains 4 index entries View the ICD-9-CM Volume 1 238.* hierarchy 238.6 also known as: Plasmacytoma NOS Solitary myeloma Index entries containing 238.6: Myeloma (multiple) (plasma cell) (plasmacytic) (M9730/3) 203.0 monostotic (M9731/1) 238.6 solitary (M9731/1) 238.6 Plasmacytoma, plasmocytoma (solitary) (M9731/1) 238.6 benign (M9731/0) - see Neoplasm, by site, benign malignant (M9731/3) 203.8 Tumor (M8000/1) - see also Neoplasm, by site, unspecified nature plasma cell (M9731/1) 238.6 benign (M9731/0) - see Neoplasm, by site, benign malignant (M9731/3) 203.8