Blister (nonthermal), unspecified great toe, sequela

This code signifies a non-thermal blister affecting the great toe, specifically indicating a sequela or late effect of a previous injury or condition. It implies that the blister is a residual problem rather than an acute event. The specific cause of the original blister is not documented or is unknown.

Use this code when documenting a chronic or persistent non-thermal blister on the great toe that is a long-term consequence of an earlier injury or condition. This is appropriate for follow-up encounters where the initial acute phase of the blister has passed, but the blister itself remains as a lasting effect.

• Ensure documentation clearly states the blister is a "sequela" or "late effect" and is non-thermal.
• Confirm the affected digit is the great toe; laterality (right/left) is unspecified with this code.
• Avoid using this code for acute blisters or blisters due to burns/frostbite.