S04 Injury of cranial nerve

The ICD-10-CM code for Injury of cranial nerve is S04 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter

19: Injury, poisoning and certain other consequences of external causes (S00-T88)

Section

S00-S09: Injuries to the head (S00-S09)

Category S04

53 codes (38 billable)

FY2026 Status

Stable since FY2024

Inclusion Terms

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

Official Coding Guidelines

Primary injury first; add codes for nerve/spinal cord (S04) and vessels (S15)

2) Primary injury with damage to nerves/blood vessels When a primary injury results in minor damage to peripheral nerves or blood vessels, the primary injury is sequenced first with additional code(s) for injuries to nerves and spinal cord (such as category S04), and/or injury to blood vessels (such as category S15). When the primary

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool