2026 ICD-10-CM Diagnosis Code G56Mononeuropathies of upper limb

ICD-10-CM Codes›G00–G99›G50-G59›G56

ICD-10-CM G56
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G56 is a non-billable ICD-10-CM category code for mononeuropathies of upper limb, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G56.00, G56.01, G56.02, and G56.03.

Code Identity

ICD-10-CM Code
G56
Billable Status
No — Non-Billable Category
Code Describes
Mononeuropathies of upper limb
Chapter
G50-G59
Nerve, nerve root and plexus disorders

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG50-G59Nerve, nerve root and plexus disorders
CategoryG56Mononeuropathies of upper limb
This CodeG56Mononeuropathies of upper limb

Specific Coding for Mononeuropathies of upper limbOverview

Non-specific codes like G56 require more characters. Use one of these billable codes instead:

  • G56.0 for Carpal tunnel syndrome

  • Use G56.00 for Carpal tunnel syndrome, unspecified upper limb

  • Use G56.01 for Carpal tunnel syndrome, right upper limb

  • Use G56.02 for Carpal tunnel syndrome, left upper limb

  • Use G56.03 for Carpal tunnel syndrome, bilateral upper limbs

  • G56.1 for Other lesions of median nerve

  • Use G56.10 for Other lesions of median nerve, unspecified upper limb

  • Use G56.11 for Other lesions of median nerve, right upper limb

  • Use G56.12 for Other lesions of median nerve, left upper limb

  • Use G56.13 for Other lesions of median nerve, bilateral upper limbs

  • G56.2 for Lesion of ulnar nerve

  • Use G56.20 for Lesion of ulnar nerve, unspecified upper limb

  • Use G56.21 for Lesion of ulnar nerve, right upper limb

  • Use G56.22 for Lesion of ulnar nerve, left upper limb

  • Use G56.23 for Lesion of ulnar nerve, bilateral upper limbs

  • G56.3 for Lesion of radial nerve

  • Use G56.30 for Lesion of radial nerve, unspecified upper limb

  • Use G56.31 for Lesion of radial nerve, right upper limb

  • Use G56.32 for Lesion of radial nerve, left upper limb

  • Use G56.33 for Lesion of radial nerve, bilateral upper limbs

  • G56.4 for Causalgia of upper limb

  • Use G56.40 for Causalgia of unspecified upper limb

  • Use G56.41 for Causalgia of right upper limb

  • Use G56.42 for Causalgia of left upper limb

  • Use G56.43 for Causalgia of bilateral upper limbs

  • G56.8 for Other specified mononeuropathies of upper limb

  • Use G56.80 for Other specified mononeuropathies of unspecified upper limb

  • Use G56.81 for Other specified mononeuropathies of right upper limb

  • Use G56.82 for Other specified mononeuropathies of left upper limb

  • Use G56.83 for Other specified mononeuropathies of bilateral upper limbs

  • G56.9 for Unspecified mononeuropathy of upper limb

  • Use G56.90 for Unspecified mononeuropathy of unspecified upper limb

  • Use G56.91 for Unspecified mononeuropathy of right upper limb

  • Use G56.92 for Unspecified mononeuropathy of left upper limb

  • Use G56.93 for Unspecified mononeuropathy of bilateral upper limbs

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

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

Patient EducationClinical

Peripheral Nerve Disorders

Nerves are like wires that carry messages back and forth between your brain and your body. Your peripheral nerves branch off from your brain and spinal cord and connect to all parts of your body, including your muscles and organs.

The full article covers:

  • What are peripheral nerves?
  • What are peripheral nerve disorders?
  • What causes peripheral nerve disorders?
  • What are the symptoms of peripheral nerve disorders?
  • How are peripheral nerve disorders diagnosed?
  • What are the treatments for peripheral nerve disorders?
  • Can peripheral nerve disorders be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G56Overview

Is G56 (Mononeuropathies of upper limb) a billable code?

No. This is a category header that groups the codes for mononeuropathies of upper limb, and headers cannot be submitted on claims. Claims for mononeuropathies of upper limb need a more specific code from this category, such as G56.00, G56.01, and G56.02.