2027 ICD-10-CM Diagnosis Code M31Other necrotizing vasculopathies

ICD-10-CM Codes›M00–M99›M30-M36›M31

ICD-10-CM M31
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M31: its own notes plus those printed at block M30-M36 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block M30-M36 Systemic connective tissue disorders applies to 84 codes
  • autoimmune disease NOS
  • collagen (vascular) disease NOS
  • systemic autoimmune disease
  • systemic collagen (vascular) disease

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block M30-M36 Systemic connective tissue disorders applies to 84 codes
  • autoimmune disease, single organ or single cell-type -code to relevant condition category

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Notes

General instructions on how these codes are used.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M31, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming M31: they are not reported together with it, unless the two conditions are unrelated.

  • L94 Other localized connective tissue disorders
    systemic connective tissue disorders (M30-M36) names M30-M36, which includes this code

Excludes2 4

These codes carry an Excludes2 note naming M31: its condition is not part of those codes, and both may be reported when the patient has both.

  • Chapter 9 (I00-I99) Diseases of the circulatory system
    systemic connective tissue disorders (M30-M36) names M30-M36, which includes this code
  • I77 Other disorders of arteries and arterioles
    collagen (vascular) diseases (M30-M36) names M30-M36, which includes this code
  • J82 Pulmonary eosinophilia, not elsewhere classified
    pulmonary eosinophilia due to systemic connective tissue disorders (M30-M36) names M30-M36, which includes this code
  • Chapter 12 (L00-L99) Diseases of the skin and subcutaneous tissue
    systemic connective tissue disorders (M30-M36) names M30-M36, which includes this code

Code First 1

These codes say to code first a condition named in the note, and M31 is one of the conditions named.

  • J84.170 Interstitial lung disease with progressive fibrotic phenotype in diseases classified elsewhere
    systemic connective tissue disorders (M30-M36) names M30-M36, which includes this code

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M31Overview

What is the ICD-10 code for other necrotizing vasculopathies?

M31 is the ICD-10-CM category for other necrotizing vasculopathies, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.