Late effect of injury to blood vessel of head, neck, and extremities

This code signifies a residual condition or complication arising from a past injury to a blood vessel in the head, neck, or extremities. These late effects can manifest as chronic pain, impaired circulation, aneurysm formation, or nerve damage, long after the initial acute injury has healed. It describes the lasting impact of vascular trauma in these specific body regions.

Use this code when documenting a current condition that is a direct consequence of a previous injury to a blood vessel in the head, neck, or an extremity. Documentation should clearly link the current manifestation to the historical vascular trauma, often through physician notes detailing the patient's history of injury and the resulting chronic sequelae. This code is appropriate when the acute phase of the original injury has passed.

• Always sequence this code after the code identifying the specific late effect (e.g., chronic pain, aneurysm).
• Ensure documentation explicitly states the "late effect" or "sequela" of a prior vascular injury, not an acute or current injury.
• Distinguish from current, acute vascular injuries (e.g., 900-904 series) which represent the initial trauma, not its long-term consequences.