Blister (nonthermal) of unspecified hand, sequela

This code signifies a non-thermal blister on an unspecified hand, documented as a sequela. A sequela indicates a condition that is a late effect or complication of an earlier injury or disease, even if the original injury or disease is no longer present. The blister itself is not due to heat or cold exposure.

Use this code when a patient presents with a blister on their hand that is a direct, long-term consequence of a previous injury or condition, and the blister's etiology is not thermal. This would apply, for example, to a blister forming years after a crush injury to the hand, or a chronic blister resulting from nerve damage.

• Always code the original injury or condition that caused the sequela first, followed by this code.
• Ensure documentation clearly states the blister is a "sequela" or "late effect" and specifies the hand (though this code is for unspecified).
• Verify the blister is explicitly non-thermal; if thermal, a different code from the T20-T32 series would be appropriate.