Corrosion of third degree of other site of trunk, sequela

This code signifies a severe, full-thickness chemical burn (corrosion) affecting an unspecified area of the patient's trunk, where the acute injury has healed and the code is used to report a late effect or complication of that prior injury. This type of burn damages all layers of skin, often extending into underlying tissue, and the "sequela" indicates that the current encounter addresses a long-term consequence of this past corrosion.

Use this code when documenting a patient encounter for a scar, contracture, chronic pain, or other persistent complication directly resulting from a previously sustained third-degree chemical burn to an unspecified part of the trunk. This code is appropriate when the initial burn has healed, and the focus of the current treatment is on managing the residual effects.

• Always use an external cause code (V00-Y99) to describe the circumstances of the corrosion, if known and applicable to the sequela.
• Do not use this code for acute burns; instead, refer to the appropriate T21.- codes for active third-degree corrosion.
• Ensure documentation clearly links the current condition to the prior third-degree chemical burn of the trunk to support the "sequela" designation.