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

C86: Other specified types of T/NK-cell lymphoma

The Other specified types of T/NK-cell lymphoma, classified under the ICD-10 code range C86, refers to a group of rare non-Hodgkin lymphomas that originate from T cells or natural killer (NK) cells. These are types of white blood cells that play a crucial role in the immune system, defending the body against infectious diseases and cancer. If these cells become cancerous, they can proliferate rapidly and spread to various parts of the body, particularly the lymph nodes, skin, gastrointestinal tract, and the nasal and oral regions. Common symptoms may include fatigue, night sweats, unexplained weight loss, and enlarged lymph nodes. The progression of these lymphomas depends on the subtype as some may advance slowly, while others can progress swiftly. This group of conditions is not contagious; however, the exact causes remain unknown.