Unspecified injury of head, sequela

This code signifies an unspecified injury to the head that is now manifesting as a sequela, meaning a late effect or complication of the initial injury. It indicates that the specific nature of the original head injury is not documented or is unknown, but its long-term consequences are being addressed.

Use this code when a patient presents with a current condition or symptom that is a direct result of a past, unspecified head injury. Documentation should clearly link the current sequela to a previous head trauma without specifying the exact type of injury (e.g., "post-concussive syndrome due to unspecified head injury years ago").

• Always sequence this code after the code describing the specific sequela (e.g., chronic headache, cognitive deficits).
• Avoid using this code if the specific type of head injury (e.g., concussion, contusion, fracture) is known and documented, even if it's a past event.
• Ensure the documentation explicitly states the condition is a "sequela" or "late effect" of an unspecified head injury.