G51: Facial nerve disorders
Codes under G51 (Facial nerve disorders). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| G51.0 | Bell's palsy | ✓ |
| G51.0 | Bell's palsy | ✓ |
| G51.1 | Geniculate ganglionitis | ✓ |
| G51.1 | Geniculate ganglionitis | ✓ |
| G51.2 | Melkersson's syndrome | ✓ |
| G51.2 | Melkersson's syndrome | ✓ |
| G51.3 | Clonic hemifacial spasm | — |
| G51.3 | Clonic hemifacial spasm | — |
| G51.4 | Facial myokymia | ✓ |
| G51.4 | Facial myokymia | ✓ |
| G51.8 | Other disorders of facial nerve | ✓ |
| G51.8 | Other disorders of facial nerve | ✓ |
| G51.9 | Disorder of facial nerve, unspecified | ✓ |
| G51.9 | Disorder of facial nerve, unspecified | ✓ |
| G51.31 | Clonic hemifacial spasm, right | ✓ |
| G51.31 | Clonic hemifacial spasm, right | ✓ |
| G51.32 | Clonic hemifacial spasm, left | ✓ |
| G51.32 | Clonic hemifacial spasm, left | ✓ |
| G51.33 | Clonic hemifacial spasm, bilateral | ✓ |
| G51.33 | Clonic hemifacial spasm, bilateral | ✓ |
| G51.39 | Clonic hemifacial spasm, unspecified | ✓ |
| G51.39 | Clonic hemifacial spasm, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code G51?
G51 is an ICD-10-CM category covering Facial nerve disorders. It contains 22 more specific diagnosis codes, 20 of which are billable.
Is G51 a billable code?
No — G51 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example G51.0 — Bell's palsy). 20 of the 22 codes under G51 are billable.
What codes fall under G51?
G51 includes G51.0, G51.0, G51.1, G51.1, G51.2, plus 17 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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