Blister (nonthermal) of left ear, sequela

This code indicates a non-thermal blister affecting the left ear, representing a late effect or complication of an initial injury or condition. It signifies that the blister is no longer an acute problem but rather a residual issue from a previous insult.

Use this code when documentation specifies a blister on the left ear that is a sequela, meaning it's a chronic or residual condition resulting from an earlier, resolved injury or disease. This is appropriate when the original cause of the blister is no longer present or being treated, but the blister itself persists as a long-term effect.

• Always sequence this sequela code after the code for the original injury or condition that caused the blister, if still relevant.
• Ensure documentation clearly states the blister is a "sequela" or "late effect" and specifies the left ear.
• Distinguish from acute blisters (S00.422A-D) or thermal blisters (T20.0-T20.9) which have different coding guidelines.