2026 ICD-10-CM Diagnosis Code M31Other necrotizing vasculopathies

ICD-10-CM Codes›M00–M99›M30-M36›M31

ICD-10-CM M31
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M31 is a non-billable ICD-10-CM category code for other necrotizing vasculopathies, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M31.0, M31.10, M31.11, and M31.19.

Code Identity

ICD-10-CM Code
M31
Billable Status
No — Non-Billable Category
Code Describes
Other necrotizing vasculopathies
Short Description
Other necrotizing vasculopathies
Same as the full description in the CMS dataset.
Chapter
M30-M36
Systemic connective tissue disorders

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM30-M36Systemic connective tissue disorders
CategoryM31Other necrotizing vasculopathies
This CodeM31Other necrotizing vasculopathies

Specific Coding for Other necrotizing vasculopathiesOverview

Non-specific codes like M31 require more characters. Use one of these billable codes instead:

  • Use M31.0 for Hypersensitivity angiitis

  • M31.1 for Thrombotic microangiopathy

  • Use M31.10 for Thrombotic microangiopathy, unspecified

  • Use M31.11 for Hematopoietic stem cell transplantation-associated thrombotic microangiopathy [HSCT-TMA]

  • Use M31.19 for Other thrombotic microangiopathy

  • Use M31.2 for Lethal midline granuloma

  • M31.3 for Wegener's granulomatosis

  • Use M31.30 for Wegener's granulomatosis without renal involvement

  • Use M31.31 for Wegener's granulomatosis with renal involvement

  • Use M31.4 for Aortic arch syndrome [Takayasu]

  • Use M31.5 for Giant cell arteritis with polymyalgia rheumatica

  • Use M31.6 for Other giant cell arteritis

  • Use M31.7 for Microscopic polyangiitis

  • Use M31.8 for Other specified necrotizing vasculopathies

  • Use M31.9 for Necrotizing vasculopathy, unspecified

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M31Overview

Is M31 (Other necrotizing vasculopathies) a billable code?

No. This is a category header that groups the codes for other necrotizing vasculopathies, and headers cannot be submitted on claims. Claims for other necrotizing vasculopathies need a more specific code from this category, such as M31.0, M31.10, and M31.11.