S04
ICD-10Non-billable categoryInjury of cranial nerve
Official ICD-10-CM descriptor (FY2026)
Injury of cranial nerve
S04 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Inclusion terms
- The selection of side should be based on the side of the body being affected
Code first
Sequence the underlying condition before this code.
- any associated intracranial injury (S06.-)
Code also
Two codes may be needed; sequencing depends on the reason for the encounter.
- any associated:
- open wound of head (S01.-)
- skull fracture (S02.-)
7th character
- The appropriate 7th character is to be added to each code from category S04
Permitted 7th characters
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
More specific codes under S04
- S04.0Injury of optic nerve and pathwayscategory
- S04.1Injury of oculomotor nervecategory
- S04.2Injury of trochlear nervecategory
- S04.3Injury of trigeminal nervecategory
- S04.4Injury of abducent nervecategory
- S04.5Injury of facial nervecategory
- S04.6Injury of acoustic nervecategory
- S04.7Injury of accessory nervecategory
- S04.8Injury of other cranial nervescategory
- S04.9Injury of unspecified cranial nervecategory
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.