Corrosion of third degree of unspecified upper arm, sequela

This code signifies a third-degree chemical burn (corrosion) affecting an unspecified area of the upper arm, where the acute injury has healed and the patient is now presenting for treatment of a complication or residual effect of that past burn. Third-degree burns involve full-thickness destruction of the skin and often underlying tissue.

Use this code when documenting conditions such as scarring, contractures, chronic pain, or functional limitations in the upper arm that are directly attributable to a previously sustained third-degree chemical burn. This code is appropriate for follow-up encounters where the sequela, not the active burn, is being managed.

• An external cause code (e.g., from T20-T32) should accompany this code to describe the circumstances of the corrosion.
• Ensure the documentation clearly links the current condition to the past third-degree corrosion of the upper arm.
• Do not use this code for active, acute third-degree chemical burns; use the acute phase code (T22.239A-S) instead.