2026 ICD-10-CM Diagnosis Code G51.8Other disorders of facial nerve

ICD-10-CM Codes›G00–G99›G50-G59›G51

ICD-10-CM G51.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G51.8 is a billable ICD-10-CM diagnosis code for other disorders of facial nerve. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nerve and nerve root disorders.

Code Identity

ICD-10-CM Code
G51.8
Billable Status
Yes — Valid for Submission
Code Describes
Other disorders of facial nerve
Short Description
Other disorders of facial nerve
Same as the full description in the CMS dataset.
Parent Code
G51
Facial nerve disorders

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG50-G59Nerve, nerve root and plexus disorders
CategoryG51Facial nerve disorders
This CodeG51.8Other disorders of facial nerve

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal nervous system function
  • Alajouanine's syndrome
  • Chorda tympani disorder
  • Chronic pain in face
  • Compression facial neuropathy
  • Cranial nerve compression
  • Dissociative neurological symptom disorder co-occurrent with facial spasm
  • Facial hemiatrophy
  • Facial neuralgia
  • Hereditary geniospasm
  • Inflammatory facial neuropathy
  • Nervus intermedius disorder
  • Persistent idiopathic facial pain
  • Risus sardonicus
  • Seventh cranial nerve abnormal

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Atrophy, atrophic(of)
      • hemifacial
        • Romberg
    • Compression
      • cranial nerve
        • seventh
    • Disorder(of)
      • nerve
        • cranial
          • seventh NEC
    • Disorder(of)
      • nerve
        • facial
          • specified NEC
    • Hemiatrophy
      • face, facial, progressive (Romberg)
    • Lesion(s) (nontraumatic)
      • chorda tympani
    • Neuritis(rheumatoid)
      • cranial nerve
        • seventh or facial
    • Neuritis(rheumatoid)
      • facial
    • Paraspasmus facialis
    • Parry-Romberg syndrome
    • Romberg's disease or syndrome

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS017
Nerve and nerve root disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Facial Neuralgia

    neuralgic syndromes which feature chronic or recurrent facial pain as the primary manifestation of disease. disorders of the trigeminal and facial nerves are frequently associated with these conditions.

  • Facial Hemiatrophy

    a syndrome characterized by slowly progressive unilateral atrophy of facial subcutaneous fat, muscle tissue, skin, cartilage, and bone. the condition typically progresses over a period of 2-10 years and then stabilizes.

  • Facial Pain

    pain in the facial region including orofacial pain and craniofacial pain. associated conditions include local inflammatory and neoplastic disorders and neuralgic syndromes involving the trigeminal, facial, and glossopharyngeal nerves. conditions which feature recurrent or persistent facial pain as the primary manifestation of disease are referred to as facial pain syndromes.

  • Facial Hemiatrophy

    progressive atrophy of the tissues that comprise half of the face.

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.

Convert G51.8 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
351.8 Facial nerve dis NEC
Approximate The match is approximate rather than exact.

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 G51.8Overview

Is G51.8 (Facial nerve disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other disorders of facial nerve on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G51.8?

Under the General Equivalence Mappings, other disorders of facial nerve converts to ICD-9-CM 351.8 (facial nerve dis NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.