External constriction of left back wall of thorax, subs

This code indicates an injury to the left posterior thoracic region caused by external compression or binding, such as from tight clothing, a seatbelt, or a restrictive device. The injury is not new but is being treated during a follow-up encounter after the initial treatment.

Use this code for patients presenting for ongoing care, follow-up, or complications related to a previously diagnosed external constriction injury of the left back wall of the thorax. This applies after the initial phase of active treatment for the acute injury has concluded.

• Requires a seventh character "D" for subsequent encounter, indicating ongoing care.
• Ensure documentation specifies the left back wall of the thorax and the external nature of the constriction.
• Do not use for initial treatment of the injury; refer to the appropriate "A" seventh character code.