Lichen simplex chronicus

Lichen simplex chronicus (LSC) is a chronic, intensely pruritic skin condition characterized by localized areas of thickened, leathery skin resulting from repetitive scratching and rubbing. It is a secondary skin condition, often arising from an underlying itch, and can occur anywhere on the body, though commonly seen on the nape of the neck, ankles, and anogenital region.

This code is appropriate for documenting a diagnosis of lichen simplex chronicus. Documentation should clearly indicate the presence of localized, thickened skin with excoriations and lichenification, consistent with chronic scratching. It is often used when the primary cause of the itch is either unknown or has been addressed.

• Differentiate from primary inflammatory dermatoses like eczema or psoriasis, which may have similar appearances but different etiologies.
• Consider coding any underlying conditions contributing to the pruritus, such as atopic dermatitis (L20.-) or contact dermatitis (L23.-, L24.-), if clearly documented.
• Avoid using this code for acute excoriations or non-lichenified chronic pruritus without the characteristic skin changes.