Immune thrombocytopenic purpura

This code identifies an autoimmune disorder characterized by a low platelet count due to the immune system mistakenly attacking and destroying its own platelets. This destruction leads to increased bleeding risk, manifesting as petechiae, purpura, and mucosal bleeding.

Assign this code for patients diagnosed with primary immune thrombocytopenia (ITP), where other causes of thrombocytopenia have been excluded. Documentation should clearly state the diagnosis of ITP, often supported by laboratory findings of isolated thrombocytopenia and the absence of other underlying conditions.

• Distinguish from secondary thrombocytopenia due to other conditions (e.g., drug-induced, infection-related); these have different codes.
• Do not use for transient neonatal thrombocytopenia or other congenital forms of thrombocytopenia.
• Ensure documentation specifies "immune" or "idiopathic" to support this specific diagnosis.