M31.0 Hypersensitivity angiitis

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

Applicable to

• Goodpasture's syndrome

Risk adjustment (HCC)

• CMS-HCC V28: HCC 93 — Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders
• CMS-HCC V22: HCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
• RxHCC V08: HCC 84 — Systemic Lupus Erythematosus and Other Systemic Connective Tissue Disorders
• ESRD V24: HCC 40

MS-DRG index

Defines the logic of DRG(s) 545-547 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 446.20 Hypersensitivity angiitis, unspecified (approximate)
• 446.21 Goodpasture's syndrome (approximate)
• 446.29 Other specified hypersensitivity angiitis (approximate)

Code annotations containing back-references to M31.0

Back-references to M31.0

• Type 2 Excludes: I77 Other disorders of arteries and arterioles ("hypersensitivity angiitis (M31.0)")
• Type 1 Excludes: L95 Vasculitis limited to skin, not elsewhere classified ("hypersensitivity angiitis (M31.0)")
• Type 1 Excludes: N08 Glomerular disorders in diseases classified elsewhere ("antiglomerular basement membrane disease (M31.0)")
• Type 1 Excludes: N08 Glomerular disorders in diseases classified elsewhere ("Goodpasture's syndrome (M31.0)")

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 M31.0

• Angiitis › hypersensitivity
• Arteritis › allergic
• Disease, diseased › antiglomerular basement membrane (anti- GBM) antibody
• Disorder (of) › glomerular (in) › Goodpasture's syndrome
• Glomerulonephritis › in (due to) › Goodpasture's syndrome
• Goodpasture's syndrome
• Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › antiglomerular basement membrane (anti-GBM) antibody NEC › in Goodpasture's syndrome
• Syndrome › pulmonary › renal (hemorrhagic) (Goodpasture's)
• Vasculitis › leukocytoclastic

Nearby codes

• M31 Other necrotizing vasculopathies
• M31.0 Hypersensitivity angiitis (this code)
• M31.1 Thrombotic microangiopathy
• M31.10 Thrombotic microangiopathy, unspecified
• M31.11 Hematopoietic stem cell transplantation-associated thrombotic microangiopathy [HSCT-TMA]
• M31.19 Other thrombotic microangiopathy
• M31.2 Lethal midline granuloma