Inj l int carotid, intcr w LOC >24 hr w ret consc lev, subs

This diagnosis code signifies a traumatic injury to the intracranial segment of the left internal carotid artery, not otherwise specified, that resulted in a loss of consciousness exceeding 24 hours. The patient has subsequently regained their pre-injury level of consciousness. This code is used for encounters following the initial treatment phase.

This code is appropriate for follow-up visits, rehabilitation, or ongoing management of a patient who sustained this specific intracranial carotid artery injury. Documentation should clearly indicate the laterality (left), the intracranial portion of the artery, the duration of unconsciousness, the return to baseline consciousness, and that the encounter is not the initial treatment.

• Ensure documentation specifies "subsequent encounter" to differentiate from initial care.
• Verify the laterality (left) and the intracranial portion of the internal carotid artery are explicitly stated.
• Confirm the duration of loss of consciousness (greater than 24 hours) and the return to pre-existing conscious level.