Blister (nonthermal) of right forearm, sequela

This code indicates a non-heat-related fluid-filled lesion on the right forearm that is a residual effect of a previous injury or condition. It signifies a persistent or late-appearing complication of an earlier trauma or dermatological event, rather than an acute presentation.

Apply this code when documenting a blister on the right forearm that is clearly identified as a long-term consequence of a prior injury, infection, or other non-thermal cause. This is appropriate when the original acute condition has resolved, but the blister remains as a sequela.

• Requires a seventh character "S" to denote sequela, indicating a late effect.
• Always link to an external cause code (V00-Y99) if the original cause of the blister is known and relevant.
• Do not use for acute blisters or those due to burns/corrosion; those require different code categories.