2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of Blood And Blood-Forming Organs 280-289 > Purpura And Other Hemorrhagic Conditions 287.* > 2006 ICD-9-CM Diagnosis 287.3 Primary thrombocytopenia View the most recent version of ICD-9-CM 287.3 Thrombocytopenia occurring in the absence of toxic exposure or a disease associated with decreased platelets. It is mediated by immune mechanisms, in most cases IMMUNOGLOBULIN G autoantibodies which attach to platelets and subsequently undergo destruction by macrophages. The disease is seen in acute (affecting children) and chronic (adult) forms. 287.3 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 287.* hierarchy 287.3 Excludes thrombotic thrombocytopenic purpura (446.6) transient thrombocytopenia of newborn (776.1)