Corrosion involving larynx and trachea with lung, sequela

This code signifies the long-term effects or complications arising from a corrosive injury that affected both the larynx and trachea, and also involved the lungs. These sequelae can manifest as chronic respiratory issues, scarring, strictures, or other persistent damage resulting from the initial chemical or thermal burn.

Use this code when documenting a patient presenting with a current condition directly attributable to a past corrosive injury to the larynx, trachea, and lungs. This applies to follow-up encounters for chronic respiratory problems, dysphonia, or other lasting impairments that are a direct consequence of the original corrosive event.

• Always use this code as a secondary diagnosis, following the code for the specific sequela being treated (e.g., chronic bronchitis, tracheal stenosis).
• Ensure documentation clearly links the current condition to the past corrosive injury.
• The "S" in the 7th character indicates sequela, meaning the residual effects of a past injury, not an acute injury.