C81-C96: Malignant neoplasms, stated or presumed to be primary, of lymphoid, haematopoietic and related tissue

C90: Multiple myeloma and malignant plasma cell neoplasms

Multiple myeloma and malignant plasma cell neoplasms are a group of cancers that develop in plasma cells, the white blood cells that produce antibodies. These conditions primarily impact the bone marrow, where plasma cells are generated. The abnormal plasma cells begin to multiply uncontrollably, replacing healthy cells in the marrow and weakening the immune system. This can result in anemia, increased bleeding and bruising, and frequent infections. Moreover, as multiple myeloma progresses, it can lead to weakened bones, causing pain and increasing the chances of fractures. The cause of multiple myeloma and malignant plasma cell neoplasms is largely unknown, but these conditions are more common in older adults, and certain genetic changes may contribute to their development. Sadly, these conditions are not curable, but can often be managed effectively to prolong a patient's lifespan.