2027 ICD-10-CM Diagnosis Code G57Mononeuropathies of lower limb

ICD-10-CM Codes›G00–G99›G50-G59›G57

ICD-10-CM G57
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G57 is a non-billable ICD-10-CM category code for mononeuropathies of lower limb, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G57.00, G57.01, G57.02, and G57.03.

Code Identity

ICD-10-CM Code
G57
Billable Status
No — Non-Billable Category
Code Describes
Mononeuropathies of lower limb
Short Description
Mononeuropathies of lower 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
CategoryG57Mononeuropathies of lower limb
This CodeG57Mononeuropathies of lower limb

Specific Coding for Mononeuropathies of lower limbOverview

Non-specific codes like G57 require more characters. Use one of these billable codes instead:

  • G57.0 for Lesion of sciatic nerve

  • Use G57.00 for Lesion of sciatic nerve, unspecified lower limb

  • Use G57.01 for Lesion of sciatic nerve, right lower limb

  • Use G57.02 for Lesion of sciatic nerve, left lower limb

  • Use G57.03 for Lesion of sciatic nerve, bilateral lower limbs

  • G57.1 for Meralgia paresthetica

  • Use G57.10 for Meralgia paresthetica, unspecified lower limb

  • Use G57.11 for Meralgia paresthetica, right lower limb

  • Use G57.12 for Meralgia paresthetica, left lower limb

  • Use G57.13 for Meralgia paresthetica, bilateral lower limbs

  • G57.2 for Lesion of femoral nerve

  • Use G57.20 for Lesion of femoral nerve, unspecified lower limb

  • Use G57.21 for Lesion of femoral nerve, right lower limb

  • Use G57.22 for Lesion of femoral nerve, left lower limb

  • Use G57.23 for Lesion of femoral nerve, bilateral lower limbs

  • G57.3 for Lesion of lateral popliteal nerve

  • Use G57.30 for Lesion of lateral popliteal nerve, unspecified lower limb

  • Use G57.31 for Lesion of lateral popliteal nerve, right lower limb

  • Use G57.32 for Lesion of lateral popliteal nerve, left lower limb

  • Use G57.33 for Lesion of lateral popliteal nerve, bilateral lower limbs

  • G57.4 for Lesion of medial popliteal nerve

  • Use G57.40 for Lesion of medial popliteal nerve, unspecified lower limb

  • Use G57.41 for Lesion of medial popliteal nerve, right lower limb

  • Use G57.42 for Lesion of medial popliteal nerve, left lower limb

  • Use G57.43 for Lesion of medial popliteal nerve, bilateral lower limbs

  • G57.5 for Tarsal tunnel syndrome

  • Use G57.50 for Tarsal tunnel syndrome, unspecified lower limb

  • Use G57.51 for Tarsal tunnel syndrome, right lower limb

  • Use G57.52 for Tarsal tunnel syndrome, left lower limb

  • Use G57.53 for Tarsal tunnel syndrome, bilateral lower limbs

  • G57.6 for Lesion of plantar nerve

  • Use G57.60 for Lesion of plantar nerve, unspecified lower limb

  • Use G57.61 for Lesion of plantar nerve, right lower limb

  • Use G57.62 for Lesion of plantar nerve, left lower limb

  • Use G57.63 for Lesion of plantar nerve, bilateral lower limbs

  • G57.7 for Causalgia of lower limb

  • Use G57.70 for Causalgia of unspecified lower limb

  • Use G57.71 for Causalgia of right lower limb

  • Use G57.72 for Causalgia of left lower limb

  • Use G57.73 for Causalgia of bilateral lower limbs

  • G57.8 for Other specified mononeuropathies of lower limb

  • Use G57.80 for Other specified mononeuropathies of unspecified lower limb

  • Use G57.81 for Other specified mononeuropathies of right lower limb

  • Use G57.82 for Other specified mononeuropathies of left lower limb

  • Use G57.83 for Other specified mononeuropathies of bilateral lower limbs

  • G57.9 for Unspecified mononeuropathy of lower limb

  • Use G57.90 for Unspecified mononeuropathy of unspecified lower limb

  • Use G57.91 for Unspecified mononeuropathy of right lower limb

  • Use G57.92 for Unspecified mononeuropathy of left lower limb

  • Use G57.93 for Unspecified mononeuropathy of bilateral lower limbs

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G57: 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 G57 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 G57, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming G57: they are not reported together with it, unless the two conditions are unrelated.

  • M79.2 Neuralgia and neuritis, unspecified
    mononeuropathies (G56-G58) names G56-G58, which includes this code

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 G57Overview

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

G57 is the ICD-10-CM category for mononeuropathies of lower limb, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is G57 (Mononeuropathies of lower limb) a billable code?

No. This is a category header that groups the codes for mononeuropathies of lower limb, and headers cannot be submitted on claims. Claims for mononeuropathies of lower limb need a more specific code from this category, such as G57.00, G57.01, and G57.02.

Can G57 be reported with M79.2?

Not as a rule. The Excludes1 note at block G50-G59, which applies to G57, 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).