G51.31 (Clonic hemifacial spasm, right) compared with G51.32 (Clonic hemifacial spasm, left), from the official CMS tabular data. G51.31 and G51.32 code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. G51.31 and G51.32 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| G51.31Clonic hemifacial spasm, right | G51.32Clonic hemifacial spasm, left | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Clonic hemifacial spasm, right is a billable ICD-10-CM diagnosis code (G51.31). | Clonic hemifacial spasm, left is a billable ICD-10-CM diagnosis code (G51.32). |
| Includes | disorders of 7th cranial nerve | disorders of 7th cranial nerve |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources