2026 ICD-10-CM Diagnosis Code S04Injury of cranial nerve

ICD-10-CM Codes›S00–T88›S00-S09›S04

ICD-10-CM S04
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S04 is a non-billable ICD-10-CM category code for injury of cranial nerve, so it cannot be submitted on claims. Use a more specific code from this category instead, such as S04.011A, S04.011D, S04.011S, and S04.012A.

Code Identity

ICD-10-CM Code
S04
Billable Status
No — Non-Billable Category
Code Describes
Injury of cranial nerve
Chapter
S00-S09
Injuries to the head

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS04Injury of cranial nerve
This CodeS04Injury of cranial nerve

Specific Coding for Injury of cranial nerveOverview

Non-specific codes like S04 require more characters. Use one of these billable codes instead:

  • S04.0 for Injury of optic nerve and pathways

  • S04.01 for Injury of optic nerve

  • S04.02 for Injury of optic chiasm

  • S04.03 for Injury of optic tract and pathways

  • S04.04 for Injury of visual cortex

  • S04.1 for Injury of oculomotor nerve

  • S04.10 for Injury of oculomotor nerve, unspecified side

  • S04.11 for Injury of oculomotor nerve, right side

  • S04.12 for Injury of oculomotor nerve, left side

  • S04.2 for Injury of trochlear nerve

  • S04.20 for Injury of trochlear nerve, unspecified side

  • S04.21 for Injury of trochlear nerve, right side

  • S04.22 for Injury of trochlear nerve, left side

  • S04.3 for Injury of trigeminal nerve

  • S04.30 for Injury of trigeminal nerve, unspecified side

  • S04.31 for Injury of trigeminal nerve, right side

  • S04.32 for Injury of trigeminal nerve, left side

  • S04.4 for Injury of abducent nerve

  • S04.40 for Injury of abducent nerve, unspecified side

  • S04.41 for Injury of abducent nerve, right side

  • S04.42 for Injury of abducent nerve, left side

  • S04.5 for Injury of facial nerve

  • S04.50 for Injury of facial nerve, unspecified side

  • S04.51 for Injury of facial nerve, right side

  • S04.52 for Injury of facial nerve, left side

  • S04.6 for Injury of acoustic nerve

  • S04.60 for Injury of acoustic nerve, unspecified side

  • S04.61 for Injury of acoustic nerve, right side

  • S04.62 for Injury of acoustic nerve, left side

  • S04.7 for Injury of accessory nerve

  • S04.70 for Injury of accessory nerve, unspecified side

  • S04.71 for Injury of accessory nerve, right side

  • S04.72 for Injury of accessory nerve, left side

  • S04.8 for Injury of other cranial nerves

  • S04.81 for Injury of olfactory [1st ] nerve

  • S04.89 for Injury of other cranial nerves

  • S04.9 for Injury of unspecified cranial nerve

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Injury of cranial nerve (S04). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • The selection of side should be based on the side of the body being affected

Code First

  • any associated intracranial injury S06

Code Also

  • any associated:
  • open wound of head S01
  • skull fracture S02

7th Character Note

  • The appropriate 7th character is to be added to each code from category S04

7th Character

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Patient EducationClinical

Peripheral Nerve Disorders

Nerves are like wires that carry messages back and forth between your brain and your body. Your peripheral nerves branch off from your brain and spinal cord and connect to all parts of your body, including your muscles and organs.

The full article covers:

  • What are peripheral nerves?
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  • What are the symptoms of peripheral nerve disorders?
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Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S04Overview

Is S04 (Injury of cranial nerve) a billable code?

No. This is a category header that groups the codes for injury of cranial nerve, and headers cannot be submitted on claims. Claims for injury of cranial nerve need a more specific code from this category, such as S04.011A, S04.011D, and S04.011S.