Blister of unsp eyelid and periocular area, sequela

This code describes a non-thermal blister affecting an unspecified eyelid or the surrounding periocular region, presenting as a late effect or complication of an initial injury or condition. It indicates that the blister itself is no longer acute but is a residual problem from a previous insult.

Use this code when documentation clearly states a non-thermal blister of the eyelid or periocular area is a sequela, meaning it's a chronic or residual condition from an earlier injury or disease. This applies when the original acute injury has healed, but the blister persists or developed as a long-term consequence.

• Requires a seventh character 'S' to denote sequela; ensure this is consistently applied.
• Always sequence the sequela code first, followed by the code(s) for the specific sequela (e.g., the blister itself, if a more specific code exists for the blister type).
• Distinguish from acute blisters (e.g., from trauma or contact dermatitis) which would use different codes without the 'S' seventh character.