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G56.4

⚠ Non-billable (Header)

Causalgia of upper limb

Diseases of the nervous system (G00-G99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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Also Known As

Complex regional pain syndrome II of upper limb

❌ Excludes1

direct

Cannot be coded with G56.4

  • • 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-)

❌ Excludes1

inherited from G56

Rules from parent category G56: Mononeuropathies of upper limb

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

Child Codes (4)

G56.40Causalgia of unspecified upper limbG56.41Causalgia of right upper limbG56.42Causalgia of left upper limbG56.43Causalgia of bilateral upper limbs

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Code Information

CodeG56.4
BillableNo — Header code
ParentG56
CategoryDiseases of the nervous system (G00-G99)
Excludes16 rule(s)
Excludes20 note(s)
Child codes4

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)