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G56.4

Non-billable

Causalgia of upper limb

G56.4 is the ICD-10-CM code for Causalgia of upper limb. It is a non-billable category code — use a more specific child code such as G56.40 for billing.

Status
Header (non-billable)
Chapter
G00-G99
Parent
G56
Subcodes
4
Edition
FY2026

G00-G99 Diseases of the nervous system

Includes

  • •Complex regional pain syndrome II of upper limb

Excludes1 — not coded here

  • •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-)

Frequently asked questions

What is ICD-10 code G56.4?
G56.4 is the ICD-10-CM code for "Causalgia of upper limb". It falls under G00-G99 Diseases of the nervous system.
Is G56.4 a billable code?
No — G56.4 is a non-billable header code. Use a more specific child code (such as G56.40) for billing.
What are the subcodes of G56.4?
G56.4 has 4 more specific child codes, including G56.40, G56.41, G56.42.
What is excluded from G56.4?
Excludes1 (not coded here): 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-).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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