M31.1Header code — not billable
Thrombotic microangiopathy
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue
- Category
- M31
- Effective date
- October 1, 2026
Related codes in category M31
M31Other necrotizing vasculopathiesM31.0Hypersensitivity angiitisYesM31.10Thrombotic microangiopathy, unspecifiedYesM31.11Hematpoetc stem cell txpltation-assoc throm microangiopathyYesM31.19Other thrombotic microangiopathyYesM31.2Lethal midline granulomaYesM31.3Wegener's granulomatosisM31.30Wegener's granulomatosis without renal involvementYesM31.31Wegener's granulomatosis with renal involvementYesM31.4Aortic arch syndrome [Takayasu]YesM31.5Giant cell arteritis with polymyalgia rheumaticaYesM31.6Other giant cell arteritisYes
Frequently asked questions
What is ICD-10 code M31.1?
M31.1 is an ICD-10-CM diagnosis code for Thrombotic microangiopathy.
Is M31.1 a billable code?
No. M31.1 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is M31.1 in?
M31.1 falls under Chapter 13: Diseases of the musculoskeletal system and connective tissue.
When did M31.1 become effective?
M31.1 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to M31.1?
M31.1 belongs to category M31, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.