I73.81 Erythromelalgia

Billable ICD-10-CM code, FY2026.

Applies from I73 Other peripheral vascular diseases

Excludes2 (not included here)

• chilblains (T69.1)
• frostbite (T33-T34)
• immersion hand or foot (T69.0-)
• spasm of cerebral artery (G45.9)

Applies from I73.8 Other specified peripheral vascular diseases

Excludes1 (never code together)

• diabetic (peripheral) angiopathy (E08-E13 with .51-.52)

Risk adjustment (HCC)

• 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)

• 443.82 Erythromelalgia

Code annotations containing back-references to I73.81

Back-references to I73.8

• Type 1 Excludes: R20.2 Paresthesia of skin ("acroparesthesia (I73.8)")
• Type 1 Excludes: R23.0 Cyanosis ("acrocyanosis (I73.8)")

Back-references to I73

• Type 1 Excludes: I96 Gangrene, not elsewhere classified ("gangrene in other peripheral vascular diseases (I73.-)")

Diagnosis Index entries for I73.81

• Acromelalgia
• Disease, diseased › Gerhardt's (erythromelalgia)
• Disease, diseased › Mitchell's (erythromelalgia)
• Disease, diseased › Weir Mitchell's (erythromelalgia)
• Erythermalgia (primary)
• Erythralgia
• Erythromelalgia
• Gerhardt's › disease (erythromelalgia)
• Mitchell's disease (erythromelalgia)
• Weir Mitchell's disease

Nearby codes

• I73.0 Raynaud's syndrome
• I73.00 Raynaud's syndrome without gangrene
• I73.01 Raynaud's syndrome with gangrene
• I73.1 Thromboangiitis obliterans [Buerger's disease]
• I73.8 Other specified peripheral vascular diseases
• I73.81 Erythromelalgia (this code)
• I73.89 Other specified peripheral vascular diseases
• I73.9 Peripheral vascular disease, unspecified