Papulosquamous disorders (L40-L45)

ICD-10 codes L40-L45 cover papulosquamous disorders, a group of inflammatory skin diseases characterized by scaly red or plaque-like rashes. These codes are primarily used to classify psoriasis and related conditions, parapsoriasis, lichen planus, pityriasis rosea, and other similar skin disorders.

This range includes detailed codes for various forms of psoriasis (L40), such as plaque psoriasis (L40.0), generalized pustular psoriasis (L40.1), and arthropathic psoriasis affecting joints (L40.5-L40.59). Synonyms like plaque psoriasis, pustular psoriasis, and psoriatic arthritis help clarify when to select these codes. The codes also cover parapsoriasis (L41), chronic inflammatory conditions with forms like pityriasis lichenoides and small or large plaque parapsoriasis. Lichen planus (L43) codes distinguish subtypes including hypertrophic or bullous lichen planus, with synonyms such as oral lichen planus and lichenoid drug reaction aiding proper coding. Other disorders include pityriasis rosea (L42) and pityriasis rubra pilaris (L44.0). These codes help healthcare professionals document and manage specific papulosquamous skin diseases with accuracy based on distinct clinical presentations and synonyms.