chronic lymphocytic leukemia hairy cell leukemia DOID:285 ICD10CM:C91.4 ICD10CM:C91.40 ICD9CM:202.4 MESH:D007943 NCI:C7402 SNOMEDCT_US_2016_03_01:118613001 SNOMEDCT_US_2016_03_01:188644003 SNOMEDCT_US_2016_03_01:188653005 SNOMEDCT_US_2016_03_01:190066005 SNOMEDCT_US_2016_03_01:54087003 SNOMEDCT_US_2016_03_01:85228003 UMLS_CUI:C0023443 disease_ontology A chronic lymphocytic leukemia that is characterized by over production of B cells (lymphocytes) by the bone marrow where the B cells appear hairy under a microscope.