NPI Atlas

G51 – Facial nerve disorders

ICD-10-CM 2027 diagnosis code · Nerve, nerve root and plexus disorders

Non-billable header

ICD-10-CM code G51

Code: G51 (claims format: G51)
Description: Facial nerve disorders
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 6. Diseases of the nervous system (G00-G99)
Block: G50-G59 Nerve, nerve root and plexus disorders

Billable codes under G51

G51 is a header code and cannot be used on claims. Choose the most specific code:

G51.0 – Bell's palsyBillable
G51.1 – Geniculate ganglionitisBillable
G51.2 – Melkersson's syndromeBillable
G51.3 – Clonic hemifacial spasmHeader (more codes below)
G51.4 – Facial myokymiaBillable
G51.8 – Other disorders of facial nerveBillable
G51.9 – Disorder of facial nerve, unspecifiedBillable

Notes for G51

Includes:

disorders of 7th cranial nerve

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block G50-G59

Excludes1 (not coded here):

current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
neuralgia NOS (M79.2)
neuritis NOS (M79.2)
peripheral neuritis in pregnancy (O26.82-)
radiculitis NOS (M54.1-)

Frequently asked questions

What is ICD-10 code G51?

G51 is the ICD-10-CM code for facial nerve disorders, in the block G50-G59 (Nerve, nerve root and plexus disorders).

Is G51 a billable code?

No. G51 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.