Blister (nonthermal) of left index finger, sequela

This code signifies a non-heat-related fluid-filled lesion on the left index finger that is a residual effect of a previous injury or condition. It indicates that the blister is no longer an acute event but rather a lasting consequence.

Use this code when documenting a patient presenting with a blister on their left index finger that is clearly identified as a long-term complication or aftermath of an earlier, resolved issue. This applies when the initial cause of the blister is no longer active, but its physical manifestation persists.

• Always ensure documentation clearly states the blister is a "sequela" or "residual effect" of a prior condition.
• Confirm the blister is specifically located on the left index finger and is not due to a burn or frostbite.
• Consider if an external cause code (e.g., W50.0XXA for accidental striking against or bumping into another person) is also needed to describe the original event if known.