Blister (nonthermal) of right back wall of thorax, sequela

This code signifies a non-thermal blister located on the right posterior aspect of the chest wall, representing a residual effect or complication of an earlier injury or condition. It indicates that the blister is not due to burns or frostbite, and its presence is a long-term consequence.

This code is appropriate for documenting a patient presenting with a persistent or chronic blister on the right back of the thorax that is a sequela of a previous injury or dermatological condition. It should be used when the original acute injury has resolved, but the blister remains as a lasting effect.

• Ensure documentation clearly specifies "sequela" to justify the 7th character 'S'.
• Verify the blister is non-thermal; if thermal, a burn code would be more appropriate.
• Confirm the exact location is the right back wall of the thorax.