M31.8 Other specified necrotizing vasculopathies

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Hypocomplementemic vasculitis
• Septic vasculitis

Risk adjustment (HCC)

• CMS-HCC V28: HCC 94 — Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders
• CMS-HCC V22: HCC 108 — Vascular Disease
• ESRD V24: HCC 108

MS-DRG index

Defines the logic of DRG(s) 299-301 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 447.5 Necrosis of artery (approximate)

Code annotations containing back-references to M31.8

Back-references to M31

• Type 2 Excludes: I77 Other disorders of arteries and arterioles ("collagen (vascular) diseases (M30-M36)")
• Type 2 Excludes: J82 Pulmonary eosinophilia, not elsewhere classified ("pulmonary eosinophilia due to systemic connective tissue disorders (M30-M36)")
• Code First: J84.170 Interstitial lung disease with progressive fibrotic phenotype in diseases classified elsewhere ("systemic connective tissue disorders (M30-M36)")
• Type 1 Excludes: L94 Other localized connective tissue disorders ("systemic connective tissue disorders (M30-M36)")

Diagnosis Index entries for M31.8

• Angiitis › necrotizing › specified NEC
• Arteritis › necrosing or necrotizing › specified NEC
• Vasculitis › hypocomplementemic
• Vasculitis › systemic
• Vasculopathy, necrotizing › specified NEC

Nearby codes

• M31.31 Wegener's granulomatosis with renal involvement
• M31.4 Aortic arch syndrome [Takayasu]
• M31.5 Giant cell arteritis with polymyalgia rheumatica
• M31.6 Other giant cell arteritis
• M31.7 Microscopic polyangiitis
• M31.8 Other specified necrotizing vasculopathies (this code)
• M31.9 Necrotizing vasculopathy, unspecified