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

C88: Malignant immunoproliferative diseases

Malignant immunoproliferative diseases are a group of conditions characterized by the abnormal growth of cells in the immune system. In these diseases, immune cells increase in number unnaturally and can invade other parts of the body, leading to a variety of health complications. These conditions can be caused by an infection or a genetic mutation, but the exact cause often remains unknown. Malignant immunoproliferative diseases often present with symptoms such as fever, fatigue, weight loss, and increased infections due to a weakened immune system response. These diseases can affect either specific or multiple systems within the body based on the type and location of cells involved. Disease progression generally involves stages of remission (when symptoms disappear) and recurrence (when symptoms return) and can vary from slow to rapid growth of abnormal cells.