Short answer · Medically reviewed summary · Last updated: 2026-05-08
The medical classification for Hemifacial Spasm (HFS) is primarily identified by the ICD-10 code G51.3, which specifically denotes clonic hemifacial spasm. In the legacy ICD-9-CM classification system, Hemifacial Spasm (HFS) is categorized under code 351.8 (other facial nerve disorders). What exactly is Hemifacial Spasm (HFS)? Hemifacial Spasm (HFS) is a rare neuromuscular disorder characterized by involuntary, irregular, and repetitive muscle contractions on one side of the face.
ICD10 code of Hemifacial Spasm (HFS) and ICD9 code
ICD-10 and ICD-9 codes for Hemifacial Spasm (HFS), with classification details for clinicians, coders and patients.
The medical classification for Hemifacial Spasm (HFS) is primarily identified by the ICD-10 code G51.3, which specifically denotes clonic hemifacial spasm. In the legacy ICD-9-CM classification system, Hemifacial Spasm (HFS) is categorized under code 351.8 (other facial nerve disorders).
What exactly is Hemifacial Spasm (HFS)?
Hemifacial Spasm (HFS) is a rare neuromuscular disorder characterized by involuntary, irregular, and repetitive muscle contractions on one side of the face. These spasms typically begin in the eyelid (orbicularis oculi) and may gradually spread to the lower facial muscles, including the cheek and mouth. Our DiseaseMaps community currently supports 13 members who are navigating the unique challenges of living with Hemifacial Spasm (HFS), emphasizing the importance of shared experiences in managing this condition.
What causes Hemifacial Spasm (HFS)?
In the vast majority of adult cases, Hemifacial Spasm (HFS) is caused by a blood vessel, typically an artery, compressing the facial nerve (cranial nerve VII) at the point where it exits the brainstem. This vascular compression leads to demyelination and aberrant nerve signaling. While rarer, secondary causes of Hemifacial Spasm (HFS) can include:
- Benign tumors or cysts pressing on the facial nerve.
- Previous facial nerve trauma or Bell’s palsy complications.
- Rare cases of multiple sclerosis or other demyelinating conditions.
How is Hemifacial Spasm (HFS) managed?
Because the condition is often structural, treatment focuses on relieving the nerve irritation. Clinical management of Hemifacial Spasm (HFS) generally follows these primary interventions:
- Botulinum Toxin Injections: The gold-standard, first-line treatment, typically administered every 3 to 4 months to temporarily paralyze the overactive facial muscles.
- Microvascular Decompression (MVD): A neurosurgical procedure where a small sponge is placed between the offending blood vessel and the facial nerve to provide permanent relief.
- Oral Medications: Anticonvulsants like carbamazepine or muscle relaxants are occasionally used, though they are generally less effective than injections or surgery.
Next steps
- Consult with a neurologist or neurosurgeon specializing in movement disorders to confirm your diagnosis.
- Keep a symptom diary to track the frequency and triggers of your facial spasms.
- Join the 13 members on DiseaseMaps.org to find support and share insights with others managing Hemifacial Spasm (HFS).
Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.
References
- NIH Genetic and Rare Diseases (GARD) Information Center - Hemifacial Spasm
- Orphanet: Rare Disease Database (ORPHA:99981)
- ICD-10-CM Data (2024): G51.3 Clonic hemifacial spasm
- HFS Association (Patient-led resource for Hemifacial Spasm)
