Papulosquamous disorders (L40-L45) ICD-10-CM
The L40–L45 section covers papulosquamous disorders with 40 ICD-10-CM diagnosis codes, of which 35 are billable in fiscal year 2026. The section is organized into the 6 code ranges listed below.
Code Ranges in This Section 6 ranges · 40 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the L40–L45 Code Range
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.
Questions About This Page
How many codes are in the L40-L45 range?
The L40-L45 range contains 40 ICD-10-CM diagnosis codes in FY 2026. 35 of them are billable, and the rest are category headers that organize the section.
What conditions does L40-L45 cover?
The range covers papulosquamous disorders. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
