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

This code signifies a non-heat-related blister located on the central anterior chest wall, specifically during a follow-up visit for the injury. It indicates a superficial skin lesion characterized by fluid accumulation, not caused by burns or frostbite, affecting the sternal or parasternal region.

Apply this code for patients presenting for subsequent treatment or evaluation of a non-thermal blister on the middle front of the thorax. This includes scenarios such as wound checks, dressing changes, or re-assessment of healing after the initial encounter.

• Ensure documentation clearly specifies "subsequent encounter" for the blister.
• Verify the blister's etiology is explicitly non-thermal (e.g., friction, allergic reaction, insect bite).
• Confirm the anatomical location is precisely the middle front wall of the thorax.