C90.2: Extramedullary plasmacytoma

Extramedullary plasmacytoma, classified under the ICD-10 code C90.2, refers to a rare type of cancer that forms in plasma cells. Plasma cells are a type of white blood cell that helps fight infections by making antibodies which recognize and attack germs. In this condition, tumors or abnormal growths develop outside the bone marrow, typically in tissues of the upper respiratory tract or the oral cavity. Symptoms vary based on where the tumor is located, but may include difficulty breathing or swallowing, nasal obstruction, and persistent pain. Plasmacytoma is usually localized to the site where it began and does not spread. However, it can progress into a more serious condition known as multiple myeloma, which affects plasma cells in multiple locations.