Other thrombotic microangiopathy

This code represents a rare, severe disorder characterized by microvascular thrombosis, leading to organ damage, often involving the kidneys, brain, and heart. It encompasses various forms of thrombotic microangiopathy (TMA) that do not fit the criteria for typical hemolytic uremic syndrome (HUS) or thrombotic thrombocytopenic purpura (TTP). The condition results from endothelial injury and platelet activation, causing microvascular occlusions.

Use this code for documented cases of thrombotic microangiopathy that are not specified as TTP (M31.11) or HUS (D59.3). This includes secondary TMAs, such as those induced by drugs, malignancy, or autoimmune diseases, or atypical forms not otherwise classified. Documentation should clearly state the diagnosis of "other thrombotic microangiopathy" or a specific type falling under this category.

• Differentiate carefully between TTP (M31.11), HUS (D59.3), and other specified TMAs to ensure accurate coding.
• Always review the medical record for the underlying cause or associated conditions, and code them as additional diagnoses.
• Avoid using this code if a more specific TMA diagnosis, such as drug-induced TMA, is documented and has a more precise code.