Blister (nonthermal), right ankle, sequela

This code signifies a non-burn related blister located on the right ankle. It indicates a chronic or residual condition resulting from an initial injury or disease process. The blister itself is the primary focus, not the underlying cause if it's no longer active.

Apply this code when documentation clearly states a blister on the right ankle that is a sequela, meaning it's a lasting effect of a previous condition. This is appropriate for follow-up encounters where the blister is still present and being managed, and the original acute injury has resolved or is no longer the primary focus of treatment.

• Ensure documentation explicitly states "sequela" or implies a chronic/residual nature of the blister.
• Verify the laterality (right ankle) is clearly documented.
• Do not use for acute blisters; look for acute injury codes instead.