External constriction of unsp back wall of thorax, sequela

This code describes a long-term or residual narrowing or compression of the posterior thoracic wall, which is not specified to a particular location. This constriction is a consequence of a previous injury or condition, indicating a persistent anatomical or functional alteration.

Use this code for patients presenting with ongoing symptoms directly attributable to a past external constriction affecting the back of the chest, such as chronic pain, restricted movement, or respiratory compromise. This applies when the acute phase of the original injury has passed, and the constriction is a lasting effect.

• Always assign this code as a secondary diagnosis, following the code for the primary condition or sequela it causes.
• Ensure documentation clearly supports the "sequela" nature, indicating a past event leading to the current constriction.
• Avoid using this code for acute or current external constrictions; reserve it for chronic, residual effects.