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

This code signifies a residual condition or late effect resulting from a non-thermal blister on an unspecified area of the back wall of the thorax. It indicates that the acute phase of the blister has passed, and the patient is now experiencing a lasting consequence, such as scarring, chronic pain, or functional impairment directly attributable to the original injury.

Utilize this code when documenting a patient presenting with a long-term complication or sequela from a blister on their back that was not caused by heat, chemicals, or radiation. This would apply, for example, to a patient with persistent scarring or nerve damage years after an acute pressure blister on their back.

• Always sequence this code after the code for the specific sequela (e.g., scar, chronic pain).
• Ensure documentation clearly links the current condition to a previous non-thermal blister on the back.
• Avoid using this code for acute or current blisters; those require codes from the acute injury section.