M31: Other necrotizing vasculopathies
Codes under M31 (Other necrotizing vasculopathies). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| M31.0 | Hypersensitivity angiitis | ✓ |
| M31.0 | Hypersensitivity angiitis | ✓ |
| M31.1 | Thrombotic microangiopathy | — |
| M31.1 | Thrombotic microangiopathy | — |
| M31.2 | Lethal midline granuloma | ✓ |
| M31.2 | Lethal midline granuloma | ✓ |
| M31.3 | Wegener's granulomatosis | — |
| M31.3 | Wegener's granulomatosis | — |
| M31.4 | Aortic arch syndrome [Takayasu] | ✓ |
| M31.4 | Aortic arch syndrome [Takayasu] | ✓ |
| M31.5 | Giant cell arteritis with polymyalgia rheumatica | ✓ |
| M31.5 | Giant cell arteritis with polymyalgia rheumatica | ✓ |
| M31.6 | Other giant cell arteritis | ✓ |
| M31.6 | Other giant cell arteritis | ✓ |
| M31.7 | Microscopic polyangiitis | ✓ |
| M31.7 | Microscopic polyangiitis | ✓ |
| M31.8 | Other specified necrotizing vasculopathies | ✓ |
| M31.8 | Other specified necrotizing vasculopathies | ✓ |
| M31.9 | Necrotizing vasculopathy, unspecified | ✓ |
| M31.9 | Necrotizing vasculopathy, unspecified | ✓ |
| M31.10 | Thrombotic microangiopathy, unspecified | ✓ |
| M31.10 | Thrombotic microangiopathy, unspecified | ✓ |
| M31.11 | Hematopoietic stem cell transplantation-associated thrombotic microangiopathy [HSCT-TMA] | ✓ |
| M31.11 | Hematopoietic stem cell transplantation-associated thrombotic microangiopathy [HSCT-TMA] | ✓ |
| M31.19 | Other thrombotic microangiopathy | ✓ |
| M31.19 | Other thrombotic microangiopathy | ✓ |
| M31.30 | Wegener's granulomatosis without renal involvement | ✓ |
| M31.30 | Wegener's granulomatosis without renal involvement | ✓ |
| M31.31 | Wegener's granulomatosis with renal involvement | ✓ |
| M31.31 | Wegener's granulomatosis with renal involvement | ✓ |
Frequently asked questions
What is ICD-10-CM code M31?
M31 is an ICD-10-CM category covering Other necrotizing vasculopathies. It contains 30 more specific diagnosis codes, 26 of which are billable.
Is M31 a billable code?
No — M31 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example M31.0 — Hypersensitivity angiitis). 26 of the 30 codes under M31 are billable.
What codes fall under M31?
M31 includes M31.0, M31.0, M31.1, M31.1, M31.2, plus 25 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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