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

C83: Non-follicular lymphoma

Non-follicular lymphoma is a type of cancer that primarily affects the body's lymph system, an important part of the immune system. This collection of conditions covers multiple forms of lymphoma that are not rooted in the lymph follicles, making them distinct from follicular lymphomas. They commonly originate in the lymph nodes, and although the exact cause is unknown, they are believed to develop when the body's lymphocytes, a type of white blood cell, undergo a malignant change and grow out of control. Symptoms may include swollen lymph nodes, fatigue, unexplained weight loss, fever, and night sweats. The progression of non-follicular lymphoma can vary greatly from person to person, and it can potentially spread to other parts of the body over time if left untreated. Non-follicular lymphoma can affect individuals of any age but is more commonly observed in adults.