Blister (nonthermal) of lower back and pelvis, sequela

This code signifies a nonthermal blister located on the lower back or pelvic region, indicating a chronic or residual effect from a previous injury or condition. It represents a skin lesion characterized by a fluid-filled sac, not caused by heat, cold, or chemical exposure, that is a lasting consequence rather than an acute event.

Use this code when documenting a patient presenting with a non-acute, non-thermal blister on the lower back or pelvis that is a direct result of a prior injury, disease, or treatment. This would apply to conditions like a pressure ulcer blister that has healed but left a residual blister, or a blister resulting from a resolved skin condition.

• Ensure the documentation clearly specifies the blister is nonthermal and located on the lower back or pelvis.
• Verify that the blister is a sequela, meaning it's a long-term effect of a previous condition, not an acute presentation.
• Always code the underlying cause of the original condition that led to the sequela, if known and still relevant.