Injury of cervical sympathetic nerves, initial encounter

This code signifies a traumatic injury to the cervical sympathetic nerve chain, which is part of the autonomic nervous system responsible for involuntary bodily functions. Such an injury can lead to conditions like Horner's syndrome, characterized by miosis, ptosis, and anhidrosis on the affected side of the face.

Apply this code for the initial encounter of a patient presenting with an acute injury to the cervical sympathetic nerves, typically following trauma to the neck, such as a motor vehicle accident, penetrating injury, or iatrogenic damage during surgery. Documentation should clearly state the mechanism of injury and the initial assessment of sympathetic nerve involvement.

• Ensure documentation specifies "initial encounter" for appropriate seventh character assignment.
• Distinguish from non-traumatic or congenital sympathetic nerve disorders, which have different codes.
• Code any associated spinal cord injuries or fractures separately.