Congenital and hereditary thrombocytopenia purpura

This code signifies a rare, inherited bleeding disorder characterized by a persistently low platelet count (thrombocytopenia) and the presence of purpura (bruising or petechiae) due to the platelet deficiency. It encompasses various genetic defects affecting platelet production or survival that are present from birth.

Apply this code when documentation confirms a diagnosis of thrombocytopenia with purpura that is explicitly stated as congenital or hereditary in origin. This typically involves a history of low platelets since infancy or early childhood, often with a family history of similar bleeding disorders, and genetic testing confirming an underlying inherited defect.

• Differentiate from acquired forms of thrombocytopenia; this code is strictly for congenital/hereditary types.
• Ensure documentation specifies "congenital" or "hereditary" to support this specific code.
• Do not use for idiopathic thrombocytopenic purpura (ITP) unless it is specifically identified as a congenital form.