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

C95: Leukaemia of unspecified cell type

Leukaemia of unspecified cell type, classified under the grouping code C95 in the ICD-10 WHO 2016 classification, is a form of blood and bone marrow cancer. It involves the overproduction of abnormal white blood cells, which hampers the normal functions of oxygen-carrying red cells, infection-fighting white cells, and clot-forming platelets. Its exact cause remains unknown, but identified risk factors include radiation exposure, chemical exposure, certain genetic conditions, and specific blood disorders. It is not a contagious disease and does not spread from person to person. Symptoms can vary greatly from one individual to another, but generally involve fatigue, easy bruising or bleeding, frequent infections, and unexplained weight loss. The disease can progress rapidly (acute) or slowly (chronic), depending on the nature of the cells involved. All body systems can potentially be affected since blood cells travel throughout the body.