M31.9 – Necrotizing vasculopathy, unspecified

ICD-10-CM 2027 diagnosis code · Systemic connective tissue disorders

Billable code

ICD-10-CM code M31.9

Code: M31.9 (claims format: M319)
Description: Necrotizing vasculopathy, unspecified
Billable: Yes – valid for HIPAA-covered transactions
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
Parent codes: M31

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

Index terms for M31.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in M31

M31.0 – Hypersensitivity angiitisBillable
M31.1 – Thrombotic microangiopathyHeader
M31.2 – Lethal midline granulomaBillable
M31.3 – Wegener's granulomatosisHeader
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

Frequently asked questions

What is ICD-10 code M31.9?

M31.9 is the ICD-10-CM code for necrotizing vasculopathy, unspecified, in the block M30-M36 (Systemic connective tissue disorders).

Is M31.9 a billable code?

Yes. M31.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M31.9 belong to?

It belongs to category M31 – Other necrotizing vasculopathies.

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.