Blister (nonthermal), unspecified thigh, sequela

This code signifies a non-burn related fluid-filled lesion on an unspecified area of the thigh, representing a late effect or complication of an initial injury or condition. The blister is not due to heat, chemicals, or radiation, and its exact location on the thigh is not specified.

Use this code when documenting a blister on the thigh that is a residual condition from a previous injury or disease process, and the blister is not caused by a thermal source. This applies when the original acute injury has healed, and the blister is a persistent or newly developed issue related to that prior event.

• Ensure the documentation clearly indicates the blister is a sequela and not an acute injury.
• Verify that the blister is explicitly stated as non-thermal and located on the thigh.
• If the specific thigh (right or left) is documented, use a more precise code from the S70.32- series.