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ICD-10-CM 2027 diagnosis code

S04Injury of cranial nerve

Not billable — use a more specific code

S04 is a header code, so it can't be reported by itself. Choose one of the 10 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About S04

S04 is the ICD-10-CM diagnosis code for injury of cranial nerve. It belongs to block S00-S09 (injuries to the head) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: S04.0 (pathways), S04.1 (nerve), S04.2 (nerve), S04.3 (nerve), S04.4 (nerve), S04.5 (nerve), S04.6 (nerve), S04.7 (nerve) and 2 more.

Code first: any associated intracranial injury (S06.-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under S04

Coding notes

Applicable toConditions and synonyms classified to this code
  • The selection of side should be based on the side of the body being affected
Code firstSequence the underlying condition first
  • any associated intracranial injury (S06.-)
Code alsoTwo codes may be needed; sequencing depends on circumstances
  • any associated:
  • open wound of head (S01.-)
  • skull fracture (S02.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to S04.

Broader instructions also apply from S00-S09 Injuries to the head and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Codes whose notes reference S04

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about S04

Is S04 billable?

No. S04 is a header code. Report one of its more specific subcodes instead.