ICD-10-CM 2027 diagnosis code

G51.3Clonic hemifacial spasm

Not billable — use a more specific code

G51.3 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code last changed in FY2019 (effective October 1, 2018). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G51.3

G51.3 is the ICD-10-CM diagnosis code for Clonic hemifacial spasm. It belongs to category G51 (facial nerve disorders), block G50-G59 (nerve, nerve root and plexus disorders) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within G51 (facial nerve disorders), G51.3 is specifically for Clonic hemifacial spasm. Related codes cover Bell's palsy (G51.0), geniculate ganglionitis (G51.1), Melkersson's syndrome (G51.2), facial myokymia (G51.4), other disorders of facial nerve (G51.8) and disorder of facial nerve, unspecified (G51.9).

To report this condition, pick the subcode that matches the documentation: G51.31 (right), G51.32 (left), G51.33 (bilateral) and G51.39 (unspecified).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2019 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 351.8 (other facial nerve disorders).

Specific codes under G51.3

Notes that apply from higher levels

Instructions written at a parent level also apply to G51.3.

› From G51 Facial nerve disorders

Includes

disorders of 7th cranial nerve

Broader instructions also apply from G50-G59 Nerve, nerve root and plexus disorders and Chapter 6: Diseases of the nervous system.

Alphabetic index entries

5 entries

Terms in the official ICD-10-CM index that lead to G51.3.

ICD-9-CM equivalent

Converter →

351.8Other facial nerve disordersapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
FY2019 (effective 10/1/2018): Expanded — no longer billable

Common questions about G51.3

Is G51.3 billable?: No. G51.3 is a header code. Report one of its more specific subcodes instead.
What is the ICD-9 code for G51.3?: The CMS General Equivalence Mappings map G51.3 to ICD-9-CM 351.8.