Blister (nonthermal) of middle front wall of thorax, sequela

This code signifies a non-heat-related blister located on the central anterior chest wall, indicating a long-term or late effect of a previous injury or condition. It describes a healed or chronic stage of a blister that was not caused by burns or frostbite.

Use this code when documenting a patient presenting with a persistent or residual blister on the sternal or parasternal region that is a consequence of a past, non-thermal trauma or dermatological event. This applies when the initial acute injury has resolved, but the blister remains as a sequela.

• Ensure documentation clearly states the blister is non-thermal and specifies its location on the middle front wall of the thorax.
• Verify that the blister is identified as a sequela, indicating it's a late effect rather than an acute injury.
• Always code the underlying cause of the original blister, if known and still relevant, as an additional diagnosis.