G56.4

ICD-10Non-billable category

Causalgia of upper limb

Official ICD-10-CM descriptor (FY2026)

Causalgia of upper limb

G56.4 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.

Inclusion terms

  • Complex regional pain syndrome II of upper limb

Excludes1

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

  • 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-)

ICD-10-CM FY2026 defines 4 codes beneath G56.4. See the ICD-10-CM index for what this site publishes.

Related codes in G56

Where this code sits

Parent code
G56

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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