Chloasma of left lower eyelid and periocular area

This code describes hyperpigmentation, specifically chloasma (melasma), affecting the skin of the left lower eyelid and the surrounding periocular region. Chloasma presents as irregular, light-to-dark brown macules or patches, often exacerbated by sun exposure or hormonal changes.

Use this code when documentation specifies melasma or chloasma localized to the left lower eyelid and the adjacent periocular area. This diagnosis is typically made clinically based on the characteristic appearance and location of the hyperpigmentation.

• Ensure documentation clearly specifies "chloasma" or "melasma" and the precise anatomical location as the left lower eyelid and periocular area.
• Distinguish from other forms of hyperpigmentation, such as post-inflammatory hyperpigmentation or nevus, which would be coded differently.
• Laterality is crucial; confirm the affected side is the left.