Injury of oth blood vessels at neck level, sequela

This code signifies a long-term or late effect resulting from a past injury to a specific, but not otherwise classified, blood vessel in the neck region. This includes conditions such as chronic pseudoaneurysm, persistent arteriovenous fistula, or chronic stenosis that developed as a direct consequence of a previous neck blood vessel trauma. The injury itself is no longer acute, and the patient is presenting for treatment of the residual complication.

Apply this code when documenting a sequela (late effect) of an injury to a blood vessel in the neck, such as the vertebral artery, external carotid artery, or other named but less common neck vessels, that is not specifically classified elsewhere. Documentation should clearly indicate that the current condition is a direct result of a previous injury and is not an acute event. This code is appropriate when the patient is being treated for the chronic complication, not the initial injury.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., I72.8 for other specified aneurysm, I77.0 for arteriovenous fistula).
• Ensure documentation explicitly states the cause of the sequela was a past injury to a neck blood vessel.
• Do not use for acute injuries; the "S" seventh character indicates sequela.