Injury of unspecified cranial nerve, sequela

This code signifies a lasting effect or complication resulting from a past injury to any of the twelve cranial nerves, where the specific nerve affected is not documented. These sequelae can manifest as persistent neurological deficits such as sensory loss, motor weakness, or autonomic dysfunction, directly attributable to the original trauma.

Apply this code when documentation clearly indicates a residual condition or late effect stemming from a previous cranial nerve injury, and the specific cranial nerve involved is not identified. This is appropriate for chronic or permanent impairments that developed after the acute phase of the original injury has passed.

• Always sequence this code after the code describing the specific sequela (e.g., facial paralysis, optic atrophy).
• Ensure documentation explicitly states the condition is a "sequela" or "late effect" of a prior injury.
• Avoid using this code if the specific cranial nerve involved is known; instead, use a more precise code from the S04.xXXS series.