ICD-10-CM 2027
ICD-10 code for facial nerve neuropathy
From the official ICD-10-CM alphabetic index entry “Neuropathy, neuropathic › facial nerve”. Page updated September 29, 2026.
About coding facial nerve neuropathy
The ICD-10-CM code for facial nerve neuropathy is G51.9 (Disorder of facial nerve, unspecified).
Within G51, choose G51.9 (Disorder of facial nerve, unspecified) only when documentation doesn't support a more specific option: Bell's palsy (G51.0), geniculate ganglionitis (G51.1), Melkersson's syndrome (G51.2), Clonic hemifacial spasm (G51.3), facial myokymia (G51.4) and other disorders of facial nerve (G51.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 073 (Cranial and Peripheral Nerve Disorders with MCC, relative weight 1.5779) and DRG 074 (Cranial and Peripheral Nerve Disorders without MCC, relative weight 1.0173), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about facial nerve neuropathy ICD-10 codes
What is the ICD-10 code for facial nerve neuropathy?
- G51.9 — Disorder of facial nerve, unspecified.
Is G51.9 billable?
- Yes. G51.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G51.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G51.9 as a principal diagnosis.
Is G51.9 a CC or MCC?
- No. G51.9 is neither a CC nor an MCC under MS-DRG v44.0.