Injury of l int carotid, intcr w LOC of unsp duration, subs

This code signifies a traumatic injury to the intracranial segment of the left internal carotid artery, resulting in a loss of consciousness for an unrecorded duration. This diagnosis is used when the patient is receiving follow-up care for the initial injury.

Apply this code for a patient presenting for ongoing treatment, monitoring, or rehabilitation related to a previously sustained intracranial left internal carotid artery injury with associated loss of consciousness. Documentation should clearly indicate a "subsequent encounter" for the injury, such as follow-up appointments, medication adjustments, or physical therapy sessions.

• Ensure documentation specifies "left" internal carotid artery and "intracranial portion" to differentiate from other carotid artery segments or sides.
• Confirm the encounter is for follow-up care (D) and not the initial treatment (A) or sequela (S).
• Always code any associated neurological deficits or complications separately and in proper sequence.