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v1.0.0
ICD-10 Guide
ICD-10 CodesG51.8

G51.8

Billable

Other disorders of facial nerve

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 G51.8 is a billable code used to indicate a diagnosis of other disorders of facial nerve.

Key Diagnostic Point:

G51.8 encompasses a variety of conditions affecting the facial nerve (cranial nerve VII) that do not fall under more specific categories. These disorders can include facial nerve neuropathies, entrapments, and other atypical presentations that lead to facial weakness or paralysis. Common causes of these disorders may include trauma, infections, or idiopathic factors. Clinically, patients may present with symptoms such as unilateral facial droop, loss of the ability to close the eye, and altered taste sensation. Diagnosis often involves a thorough clinical examination, and may be supplemented by imaging studies or nerve conduction studies to assess the integrity and function of the facial nerve. Treatment options vary based on the underlying cause and may include corticosteroids, physical therapy, or surgical intervention in cases of entrapment. Accurate coding is essential for appropriate reimbursement and to ensure that the patient's medical history reflects the complexity of their condition.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of underlying causes leading to similar symptoms
  • Need for comprehensive clinical documentation
  • Potential overlap with other cranial nerve disorders
  • Variability in treatment approaches based on etiology

Audit Risk Factors

  • Inadequate documentation of the specific disorder
  • Failure to provide supporting evidence for the diagnosis
  • Misclassification of the condition under a more specific code
  • Lack of follow-up documentation to support ongoing treatment

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed neurological examination findings, imaging results, and nerve conduction study reports.

Common Clinical Scenarios

Patients presenting with sudden onset facial weakness, post-viral facial nerve dysfunction, or atypical facial pain.

Billing Considerations

Neurologists must ensure that all potential causes are explored and documented to justify the use of G51.8.

Otolaryngology

Documentation Requirements

Thorough history of symptoms, physical examination findings, and any surgical notes if applicable.

Common Clinical Scenarios

Patients with facial nerve involvement due to tumors, infections, or trauma.

Billing Considerations

Otolaryngologists should document the anatomical considerations and any surgical interventions performed.

Coding Guidelines

Inclusion Criteria

Use G51.8 When
  • According to ICD
  • 10 coding guidelines, G51
  • 8 should be used when the specific disorder of the facial nerve is not classified elsewhere
  • Coders must ensure that the documentation supports the diagnosis and that all relevant clinical details are included

Exclusion Criteria

Do NOT use G51.8 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

95870CPT Code

Nerve conduction studies

Clinical Scenario

Used to evaluate the function of the facial nerve in patients with suspected neuropathy.

Documentation Requirements

Document the rationale for the study, findings, and any subsequent treatment plans.

Specialty Considerations

Neurologists and physiatrists often perform these studies to assess nerve function.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more precise coding of facial nerve disorders, enabling better tracking of these conditions and their outcomes. G51.8 provides a specific code for atypical presentations that were previously underrepresented in ICD-9.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more precise coding of facial nerve disorders, enabling better tracking of these conditions and their outcomes. G51.8 provides a specific code for atypical presentations that were previously underrepresented in ICD-9.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more precise coding of facial nerve disorders, enabling better tracking of these conditions and their outcomes. G51.8 provides a specific code for atypical presentations that were previously underrepresented in ICD-9.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What are the common causes of disorders coded under G51.8?

Common causes include trauma, infections, idiopathic factors, and entrapments that affect the facial nerve, leading to symptoms such as facial weakness or paralysis.