G56.4 Causalgia of upper limb

⚠ Non-Billable ICD-10-CM 2026
Open G56.4 in Web App →

The ICD-10-CM code for Causalgia of upper limb is G56.4 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
G50-G59: Nerve, nerve root and plexus disorders (G50-G59)
Category G56
36 codes (28 billable)
FY2026 Status
Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to G56.4:

  • Causalgia (upper limb)
Excludes1
Not coded here. These conditions should NOT be coded together 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-)

Inclusion Terms

  • Complex regional pain syndrome II of upper limb

Official Coding Guidelines

Dominant/nondominant side (TOC entry)

a. Dominant/nondominant side ................................................................................................. 45

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.6.a
Pain - Category G89 (TOC entry)

b. Pain - Category G89.............................................................................................................. 45

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.6.b

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

Parent Code

G56 Mononeuropathies of upper limb

More Specific Codes

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

Related Codes in G56

G56 Mononeuropathies of upper limb G56.0 Carpal tunnel syndrome G56.00 Carpal tunnel syndrome, unspecified upper limb G56.01 Carpal tunnel syndrome, right upper limb G56.02 Carpal tunnel syndrome, left upper limb G56.03 Carpal tunnel syndrome, bilateral upper limbs G56.1 Other lesions of median nerve G56.10 Other lesions of median nerve, unspecified upper limb G56.11 Other lesions of median nerve, right upper limb G56.12 Other lesions of median nerve, left upper limb G56.13 Other lesions of median nerve, bilateral upper limbs G56.2 Lesion of ulnar nerve G56.20 Lesion of ulnar nerve, unspecified upper limb G56.21 Lesion of ulnar nerve, right upper limb G56.22 Lesion of ulnar nerve, left upper limb G56.23 Lesion of ulnar nerve, bilateral upper limbs G56.3 Lesion of radial nerve G56.30 Lesion of radial nerve, unspecified upper limb G56.31 Lesion of radial nerve, right upper limb G56.32 Lesion of radial nerve, left upper limb
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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