Injury of l int carotid, intcr w LOC of 31-59 min, init

This code signifies a traumatic injury to the intracranial segment of the left internal carotid artery, not otherwise specified, resulting in a moderate period of unconsciousness lasting between 31 and 59 minutes. This diagnosis indicates a significant head injury affecting a major cerebral blood vessel.

This code is appropriate for initial encounters where a patient presents with a documented traumatic injury to the left intracranial internal carotid artery and a Glasgow Coma Scale (GCS) assessment or other clinical notes confirm a loss of consciousness within the specified 31-59 minute timeframe. Documentation should clearly specify the laterality and intracranial portion of the artery involved.

• Ensure documentation explicitly states the intracranial portion of the left internal carotid artery was injured, not the extracranial.
• Verify the duration of loss of consciousness falls precisely within the 31-59 minute range; other durations require different codes.
• This "A" suffix indicates an initial encounter for active treatment; subsequent care would require different seventh characters.