Leukocytosis ICD-10-CM codes

D72.829 is elevated white blood cell count, unspecified, and is the index entry for leukocytosis and elevated WBC with no further detail. When the cell type is documented, use the specific code: D72.820 lymphocytosis, D72.821 monocytosis, D72.822 plasmacytosis, D72.823 leukemoid reaction, D72.824 basophilia, and D72.825 bandemia. Neutrophilia has no index entry of its own; it falls under elevated white blood cell count, specified NEC, which is D72.828.

Eosinophilia has its own subcategory, D72.1-, with D72.10 for unspecified eosinophilia and D72.11- for hypereosinophilic syndrome. Hereditary giant neutrophilia and other genetic leukocyte anomalies are D72.0.

Leukocytosis is a lab finding, so it is not coded when it is part of a confirmed diagnosis such as sepsis (A41.9) or leukemia. When it is caused by a properly taken drug, such as steroid-induced leukocytosis, add the adverse effect code, for example T38.0X5A for glucocorticoids.