Blister (nonthermal) of unspecified shoulder, sequela

This code signifies a non-burn related blister that has developed on an unspecified shoulder, indicating that the acute phase of the injury has passed and the blister is a residual effect. It represents a chronic or late effect of a previous injury or condition that caused the blister formation.

Apply this code when documenting a patient presenting with a blister on the shoulder that is not due to heat or cold, and the medical record clearly indicates that this blister is a long-term consequence of an earlier event. This is appropriate for follow-up encounters where the original cause of the blister is no longer active, but the blister itself persists as a sequela.

• Always ensure the documentation explicitly states the blister is a "sequela" or "late effect" and is non-thermal.
• If the specific shoulder (right or left) is known, a more specific code should be used.
• Code first the underlying condition or external cause if it is still relevant and being treated.