ICD-10-CM > C00-D49 > D37-D48 > D47 > D47.3 D47.3 Essential (hemorrhagic) thrombocythemia Billable/Specific Copy Code Copy Description Applicable To Essential thrombocytosisIdiopathic hemorrhagic thrombocythemiaPrimary thrombocytosis Type 2 Excludes reactive thrombocytosis (D75.838)secondary thrombocytosis (D75.838)thrombocythemia NOS (D75.839)thrombocytosis NOS (D75.839)