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G56.40

G56.40: Causalgia of unspecified upper limb

Billable / specific codeICD-10-CMunspecified

G56.40 is a billable, specific ICD-10-CM code for causalgia of unspecified upper limb. It is valid for submission on a claim.

Check G56.40 with the rest of the claim: free scrubber

Excludes1 inherited from the categories above G56.40

A category’s note binds every code beneath it.

Written on G56.4: Causalgia of upper limb

  • complex regional pain syndrome I of lower limb (G90.52-)
  • complex regional pain syndrome I of upper limb (G90.51-)
  • complex regional pain syndrome II of lower limb (G57.7-)
  • reflex sympathetic dystrophy of lower limb (G90.52-)
  • reflex sympathetic dystrophy of upper limb (G90.51-)

Written on G56: Mononeuropathies of upper limb

  • current traumatic nerve disorder - see nerve injury by body region

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

G56.40 is named in 10 Medicare coverage policies: 9 listing it as supporting medical necessity, and 1 listing it as NOT covered. Which one applies depends on your Medicare contractor.

  • A56731Billing and Coding: Nerve Blocks and Electrostimulation for Peripheral Neuropathynot covered
  • A56607Billing and Coding: Continuous Peripheral Nerve Blocks (CPNB)
  • A57204Billing and Coding: MRI and CT Scans of the Head and Neck
  • A57668Billing and Coding: Nerve Conduction Studies and Electromyography

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under G56.4

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.