M31.1 is the ICD-10 code for Thrombotic microangiopathy. It is a four-character subcategory of M31 (Other necrotizing vasculopathies), the most specific level in the WHO edition. It belongs to the block M30–M36 (Systemic connective tissue disorders) in Chapter XIII, Diseases of the musculoskeletal system and connective tissue.
- Code type
- Subcategory (4 characters)
- Chapter
- XIII · M00–M99
- Classification
- WHO ICD-10, 2019 version
What M31.1 includes
Conditions and terms that are coded here.
- Thrombotic thrombocytopenic purpura
M31.1 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
M31.1Trombotisk trombocytopen purpura
DM311Microangiopathia thrombotica
- DM311ATrombotisk trombocytopenisk purpura
- DM311BBuergers sygdom
M31.1Tromboottinen mikroangiopatia
M31.1Thrombotische Mikroangiopathie
M31.1Microangiopathie thrombotique
M31.1trombotische microangiopathie
Listed through more specific codes:
- M31.10Thrombotic microangiopathy, unspecified
- M31.11Hematopoietic stem cell transplantation-associated thrombotic microangiopathy [HSCT-TMA]
- M31.19Other thrombotic microangiopathy
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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