Since it is not clear you should ask the dr for clarification, or someone with ICD9 coding. I came up with the following:
287.4 Secondary thrombocytopenia
Posttransfusion purpura
Thrombocytopenia (due to):
dilutional
drugs
extracorporeal circulation of blood
massive blood transfusion
platelet alloimmunization
Use additional E code to identify cause
Excludes:
heparin-induced thrombocytopenia (HIT) (289.84)
transient thrombocytopenia of newborn (776.1)
287.3 Primary thrombocytopenia
Excludes:
thrombotic thrombocytopenic purpura (446.6)
transient thrombocytopenia of newborn (776.1
287.33 Congenital and hereditary thrombocytopenic purpura
Congenital and hereditary thrombocytopenia
Thrombocytopenia with absent radii (TAR) syndrome
Excludes:
Wiskott-Aldrich syndrome (279.12)
287.39 Other primary thrombocytopenia
287.5 Thrombocytopenia, unspecified
289.84 Heparin-induced thrombocytopenia (HIT)
287.30 Primary thrombocytopenia unspecified
Megakaryocytic hypoplasia