Chloasma of left upper eyelid and periocular area

This code describes a specific type of hyperpigmentation, known as chloasma or melasma, affecting the skin of the left upper eyelid and the surrounding periocular region. It presents as irregular, often symmetric, brown patches, commonly exacerbated by sun exposure or hormonal changes.

Use this code when documentation clearly indicates chloasma localized to the left upper eyelid and the adjacent periocular area. This typically occurs in scenarios involving hormonal influences (e.g., pregnancy, oral contraceptives) or significant sun exposure. Supporting documentation should specify the laterality and exact anatomical location.

• Ensure documentation specifies "left" upper eyelid and periocular area; do not use for bilateral or unspecified laterality.
• Distinguish from other forms of hyperpigmentation or nevi; chloasma typically presents as diffuse patches.
• Consider additional codes for underlying causes if documented, such as pregnancy (O99.89) or drug-induced conditions (L81.1).