ICD-10-CM diagnosis code
M31.9 Necrotizing vasculopathy, unspecified
- Billable
- Yes, a complete code (FY2026)
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Other codes in M31
13 complete codes in this category.
- M31.10Thrombotic microangiopathy, unspecified
- M31.11Hematopoietic stem cell transplantation-associated thrombotic microangiopathy [HSCT-TMA]
- M31.19Other thrombotic microangiopathy
- M31.2Lethal midline granuloma
- M31.30Wegener's granulomatosis without renal involvement
- M31.31Wegener's granulomatosis with renal involvement
- M31.4Aortic arch syndrome [Takayasu]
- M31.5Giant cell arteritis with polymyalgia rheumatica
- M31.6Other giant cell arteritis
- M31.7Microscopic polyangiitis
- M31.8Other specified necrotizing vasculopathies
- M31.9Necrotizing vasculopathy, unspecified
Documentation tips
- Make sure the note supports every element of the title, “Necrotizing vasculopathy, unspecified”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to M31.
The international WHO ICD-10 also has M31.9, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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