G56.4

Non-Billable

ChapterG00–G99

Ranksubcategory

Official Description

Causalgia of upper limb

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Non-billable category (requires more specific sub-code).
•Chapter 6: Diseases of the Nervous System (G00-G99).

Instructional Notes

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-)

General instructions are available for the parent sections:

View CH6 Notes View G50-G59 Notes View G56 Notes

Clinical Hierarchy

CH6Diseases of the nervous system (G00-G99)

G50-G59Nerve, nerve root and plexus disorders (G50-G59)

G56Mononeuropathies of upper limb

G56.4Causalgia of upper limb

G56.40Causalgia of unspecified upper limb

G56.41Causalgia of right upper limb

G56.42Causalgia of left upper limb

G56.43Causalgia of bilateral upper limbs

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to G56.4:

categoryG56

Mononeuropathies of upper limb

View context instructions

blockG50-G59

Nerve, nerve root and plexus disorders (G50-G59)

View context instructions

chapterCH6

Diseases of the nervous system (G00-G99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to G56.4. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

1 raw paths

Causalgia (upper limb)1 unique routes

Direct index entry→G56.4

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Causalgia of upper limb.

Search PCS Codes