2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Malignant Neoplasm Of Lymphatic And Hematopoietic Tissue 200-208 > Lymphoid Leukemia 204.* > 2008 ICD-9-CM Diagnosis 204.0 Lymphoid leukemia acute  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 204.0 can be accessed here. A quickly progressing disease in which too many immature white blood cells called lymphoblasts are found in the blood and bone marrow. Leukemia with an acute onset, characterized by the presence of lymphoblasts or Burkitt cells in the bone marrow and the peripheral blood. It includes the precursor B lymphoblastic leukemia, precursor T lymphoblastic leukemia, and Burkitt's leukemia. Lymphocytic leukemia where cells show little differentiation. There are three major subgroups (FAB L1, L2, & L3) based on distinguishing characteristics of the blast cells. Adult and childhood forms of the disease show biological differences as well. 204.0 is a non-specific code that cannot be used to specify a diagnosis 204.0 contains 5 index entries View the ICD-9-CM Volume 1 204.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 204.0 excludes: acute exacerbation of chronic lymphoid leukemia (204.1) Index entries containing 204.0: Leukemia, leukemic (congenital) (M9800/3) 208.9 lymphatic (M9820/3) 204.9 acute (M9821/3) 204.0 lymphoblastic (M9821/3) 204.0 lymphocytic (M9820/3) 204.9 acute (M9821/3) 204.0 lymphoid (M9820/3) 204.9 acute (M9821/3) 204.0 blastic (M9821/3) 204.0