Blister (nonthermal) of flank, sequela

This code signifies a non-burn related blister located on the flank region, specifically indicating that this blister is a residual effect or complication of a previous injury or condition. It describes a healed or chronic stage of a blister, rather than an acute presentation.

Use this code when documenting a patient presenting with a blister on their side (flank area) that is clearly identified as a long-term consequence of an earlier, resolved issue. This applies to situations where the blister is no longer acute but represents a persistent or recurring problem stemming from a prior event.

• Requires a seventh character "S" to denote sequela, indicating a late effect.
• Ensure documentation clearly links the blister to a previous injury or condition.
• Do not use for acute, current blisters; those would typically be coded with an "A" (initial encounter) or "D" (subsequent encounter) seventh character.