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v1.0.0
ICD-10 Guide
ICD-10 CodesG51.33

G51.33

Billable

Clonic hemifacial spasm, bilateral

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

Code Description

ICD-10 G51.33 is a billable code used to indicate a diagnosis of clonic hemifacial spasm, bilateral.

Key Diagnostic Point:

Clonic hemifacial spasm is characterized by involuntary, intermittent contractions of the muscles on one side of the face, which can become bilateral over time. This condition is often associated with irritation or compression of the facial nerve (cranial nerve VII), typically due to vascular compression, tumors, or other structural anomalies. Patients may experience episodes of twitching or spasms that can be triggered by stress, fatigue, or specific facial movements. The bilateral aspect of this condition indicates that both sides of the face are affected, which can complicate the clinical picture and management. Diagnosis is primarily clinical, supported by imaging studies such as MRI to rule out structural causes. Treatment options may include botulinum toxin injections, which can provide symptomatic relief, or surgical interventions in more severe cases. Understanding the underlying pathophysiology, including the role of cranial nerve disorders and potential neuropathies, is crucial for effective management and coding.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Bilateral presentation complicates diagnosis and treatment.
  • Potential overlap with other cranial nerve disorders.
  • Need for precise documentation of symptoms and triggers.
  • Variability in treatment approaches may affect coding.

Audit Risk Factors

  • Inadequate documentation of bilateral symptoms.
  • Failure to specify the underlying cause of nerve irritation.
  • Misclassification with other facial movement disorders.
  • Lack of clarity on treatment modalities used.

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed neurological examination findings, imaging results, and treatment plans.

Common Clinical Scenarios

Patients presenting with facial spasms, history of facial nerve injury, or post-surgical complications.

Billing Considerations

Ensure clear documentation of the onset, duration, and frequency of spasms.

Otolaryngology

Documentation Requirements

Assessment of facial nerve function, imaging studies, and surgical notes if applicable.

Common Clinical Scenarios

Patients with facial nerve compression due to tumors or vascular anomalies.

Billing Considerations

Document any surgical interventions or referrals for further management.

Coding Guidelines

Inclusion Criteria

Use G51.33 When
  • According to ICD
  • 10 guidelines, G51
  • 33 should be used when the clinical documentation specifies bilateral clonic hemifacial spasm
  • It is important to ensure that the diagnosis is supported by clinical findings and any relevant imaging studies

Exclusion Criteria

Do NOT use G51.33 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

64612CPT Code

Injection, botulinum toxin type A

Clinical Scenario

Used for treatment of hemifacial spasm.

Documentation Requirements

Document the number of units injected and the specific muscles targeted.

Specialty Considerations

Neurology and pain management specialists should ensure accurate coding of the procedure.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like clonic hemifacial spasm, improving the accuracy of data collection and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like clonic hemifacial spasm, improving the accuracy of data collection and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

Resources

Clinical References

  • •
    American Academy of Neurology
  • •
    National Institute of Neurological Disorders and Stroke

Coding & Billing References

  • •
    American Academy of Neurology
  • •
    National Institute of Neurological Disorders and Stroke

Frequently Asked Questions

What are the common treatments for clonic hemifacial spasm?

Common treatments include botulinum toxin injections, which can reduce muscle contractions, and surgical options for severe cases.

How can I differentiate between hemifacial spasm and facial nerve palsy?

Hemifacial spasm involves involuntary muscle contractions, while facial nerve palsy typically presents with weakness or paralysis of facial muscles.