Blister (nonthermal) of unspecified parts of thorax, sequela

This code signifies a non-burn related blister that has developed on an unspecified area of the chest wall, representing a long-term effect or complication of a previous injury or condition. It indicates that the initial cause of the blister is no longer acute, and the current presentation is a residual manifestation.

Apply this code when documenting a patient presenting with a non-thermal blister on the thorax, and the medical record clearly indicates that this blister is a sequela. This would be appropriate for conditions such as a persistent blister resulting from a healed skin infection, a resolved allergic reaction, or a past traumatic event where the blister is a chronic consequence.

• Ensure documentation explicitly states the blister is a "sequela" or a "late effect" and is non-thermal.
• Avoid using this code if the blister is acute, due to a burn, or if the specific location on the thorax is known.
• Always sequence this code after the code for the underlying condition or injury that caused the sequela, if applicable and still being treated.