Blister (nonthermal) of throat, sequela

This code describes a non-thermal blister located in the throat, specifically indicating that it is a sequela of a previous injury or condition. A sequela represents a residual effect or condition that arises as a direct consequence of an earlier disease or injury, even after the primary condition has resolved.

Use this code when documentation clearly indicates a blister in the throat that is not due to heat or cold exposure, and it is explicitly stated to be a long-term complication or late effect of a prior injury or illness. The patient's medical record should detail the original cause of the blister and its relationship as a sequela.

• Ensure the documentation specifies "sequela" and the blister is "nonthermal."
• An external cause code (V00-Y99) should be used in conjunction to identify the original cause of the sequela, if known.
• Do not use this code for acute, current non-thermal blisters; those would be coded with an acute injury code.