Inj l int crtd, intcrn portion, NEC LOC status unknown, subs

This code signifies a traumatic injury to the intracranial segment of the left internal carotid artery, where the patient experienced a loss of consciousness of unknown duration. This diagnosis indicates a subsequent encounter for care related to this specific cerebrovascular injury.

Use this code for follow-up visits, rehabilitation, or ongoing management of a patient previously diagnosed with an intracranial left internal carotid artery injury due to trauma, where the initial loss of consciousness duration was not documented. Documentation should clearly state "subsequent encounter" and specify the left internal carotid artery, intracranial portion, and the unknown status of loss of consciousness.

• Ensure documentation specifies "subsequent encounter" and the laterality (left) of the injury.
• Distinguish from initial encounters (A) or sequela (S) codes for the same injury.
• Verify the intracranial portion of the carotid artery is explicitly documented to differentiate from extracranial injuries.