2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Mononeuropathies of upper limb
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G56: its own notes plus those printed at block G50-G59 and Chapter 6. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On G56 itself
  • current traumatic nerve disorder - see nerve injury by body region
From Block G50-G59 Nerve, nerve root and plexus disorders applies to 106 codes
  • current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
  • neuralgia NOS (M79.2)
  • neuritis NOS (M79.2)
  • peripheral neuritis in pregnancy (O26.82-)
  • radiculitis NOS (M54.1-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name G56, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming G56: they are not reported together with it, unless the two conditions are unrelated.

  • M79.2 Neuralgia and neuritis, unspecified
    mononeuropathies (G56-G58)

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G56Overview

What is the ICD-10 code for mononeuropathies of upper limb?

G56 is the ICD-10-CM category for mononeuropathies of upper limb, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Can G56 be reported with M79.2?

Not as a rule. The Excludes1 note at block G50-G59, which applies to G56, lists "neuralgia NOS (M79.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).