2027 ICD-10-CM Diagnosis Code G51Facial nerve disorders

ICD-10-CM Codes›G00–G99›G50-G59›G51

ICD-10-CM G51
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G51 is a non-billable ICD-10-CM category code for facial nerve disorders, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G51.0, G51.1, G51.2, and G51.31.

Code Identity

ICD-10-CM Code
G51
Billable Status
No — Non-Billable Category
Code Describes
Facial nerve disorders
Short Description
Facial nerve disorders
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
CategoryG51Facial nerve disorders
This CodeG51Facial nerve disorders

Specific Coding for Facial nerve disordersOverview

Non-specific codes like G51 require more characters. Use one of these billable codes instead:

  • Use G51.0 for Bell's palsy

  • Use G51.1 for Geniculate ganglionitis

  • Use G51.2 for Melkersson's syndrome

  • G51.3 for Clonic hemifacial spasm

  • Use G51.31 for Clonic hemifacial spasm, right

  • Use G51.32 for Clonic hemifacial spasm, left

  • Use G51.33 for Clonic hemifacial spasm, bilateral

  • Use G51.39 for Clonic hemifacial spasm, unspecified

  • Use G51.4 for Facial myokymia

  • Use G51.8 for Other disorders of facial nerve

  • Use G51.9 for Disorder of facial nerve, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G51: 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.

Includes

Further defines, or gives examples of, the content of the category.

  • disorders of 7th cranial nerve

Excludes1

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

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.

Clinical InformationClinical

  • Facial Nerve Diseases

    diseases of the facial nerve or nuclei. pontine disorders may affect the facial nuclei or nerve fascicle. the nerve may be involved intracranially, along its course through the petrous portion of the temporal bone, or along its extracranial course. clinical manifestations include facial muscle weakness, loss of taste from the anterior tongue, hyperacusis, and decreased lacrimation.

Patient EducationClinical

Facial Injuries and Disorders

Face injuries and disorders can cause pain and affect how you look. In severe cases, they can affect sight, speech, breathing and your ability to swallow. Fractures (broken bones), especially in the bones of your nose, cheekbone and jaw, are common facial injuries.

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 G51Overview

What is the ICD-10 code for facial nerve disorders?

G51 is the ICD-10-CM category for facial nerve disorders, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is G51 (Facial nerve disorders) a billable code?

No. This is a category header that groups the codes for facial nerve disorders, and headers cannot be submitted on claims. Claims for facial nerve disorders need a more specific code from this category, such as G51.0, G51.1, and G51.2.

Can G51 be reported with M79.2?

Not as a rule. The Excludes1 note at block G50-G59, which applies to G51, 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).