ICD-10 Code G51.0 – Bell’s palsy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G51.0 – Bell’s palsy
What it is
G51.0 identifies Bell’s palsy, an acute peripheral facial nerve paralysis affecting one side of the face. It is used when documentation supports idiopathic facial weakness rather than another known cause.
Clinical signs
Typical findings include sudden unilateral facial droop, incomplete eye closure, and reduced forehead movement on the affected side. Clinical features vary; refer to documentation.
When to use this code
Use G51.0 when the record clearly states Bell’s palsy or idiopathic facial nerve palsy. It fits cases with isolated peripheral facial weakness after evaluation excludes stroke, trauma, infection, or other documented causes. Check documentation if the cause is uncertain.
Do not use for
Do not use this code for facial weakness with a documented central neurologic cause, such as stroke. Also avoid it when the palsy is attributed to trauma, surgery, tumor, or another specific condition.
Coding tip
Confirm that the provider documents Bell’s palsy or idiopathic palsy before assigning G51.0.