M31 – Other necrotizing vasculopathies
ICD-10-CM 2027 diagnosis code · Systemic connective tissue disorders
ICD-10-CM code
M31
- Code
M31(claims format:M31)- Description
- Other necrotizing vasculopathies
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
- Block
- M30-M36 Systemic connective tissue disorders
Billable codes under M31
M31 is a header code and cannot be used on claims. Choose the most specific code:
- M31.0 – Hypersensitivity angiitisBillable
- M31.1 – Thrombotic microangiopathyHeader (more codes below)
- M31.2 – Lethal midline granulomaBillable
- M31.3 – Wegener's granulomatosisHeader (more codes below)
- M31.4 – Aortic arch syndrome [Takayasu]Billable
- M31.5 – Giant cell arteritis with polymyalgia rheumaticaBillable
- M31.6 – Other giant cell arteritisBillable
- M31.7 – Microscopic polyangiitisBillable
- M31.8 – Other specified necrotizing vasculopathiesBillable
- M31.9 – Necrotizing vasculopathy, unspecifiedBillable
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block M30-M36
Includes:
- autoimmune disease NOS
- collagen (vascular) disease NOS
- systemic autoimmune disease
- systemic collagen (vascular) disease
Excludes1 (not coded here):
- autoimmune disease, single organ or single cell-type -code to relevant condition category
Frequently asked questions
What is ICD-10 code M31?
M31 is the ICD-10-CM code for other necrotizing vasculopathies, in the block M30-M36 (Systemic connective tissue disorders).
Is M31 a billable code?
No. M31 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.