2026 ICD-10-CM Diagnosis Code G51.33Clonic hemifacial spasm, bilateral

ICD-10-CM Codes›G00–G99›G50-G59›G51

ICD-10-CM G51.33
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G51.33 is a billable ICD-10-CM diagnosis code for clonic hemifacial spasm, bilateral. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as bilateral hemifacial spasm. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nerve and nerve root disorders.

Code Identity

ICD-10-CM Code
G51.33
Billable Status
Yes — Valid for Submission
Code Describes
Clonic hemifacial spasm, bilateral
Short Description
Clonic hemifacial spasm, bilateral
Same as the full description in the CMS dataset.
Parent Code
G51.3
Clonic hemifacial spasm

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG50-G59Nerve, nerve root and plexus disorders
CategoryG51Facial nerve disorders
This CodeG51.33Clonic hemifacial spasm, bilateral

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral hemifacial spasm
  • Disorder of left facial nerve
  • Disorder of right facial nerve
  • Hemifacial spasm
  • Hemifacial spasm of left facial nerve
  • Hemifacial spasm of right facial nerve

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

  • Hemifacial Spasm

    recurrent clonic contraction of facial muscles, restricted to one side. it may occur as a manifestation of compressive lesions involving the seventh cranial nerve (facial nerve diseases), during recovery from bell palsy, or in association with other disorders. (from adams et al., principles of neurology, 6th ed, p1378)

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 History & ChangesHistory

Replacement G51.33 replaces the following previously assigned code(s):

  • G51.3 - Clonic hemifacial spasm
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G51.33Overview

Is G51.33 (Clonic hemifacial spasm) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report clonic hemifacial spasm, bilateral on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.