Psoriasis (L40) ICD-10-CM
The L40 code range covers psoriasis with 15 ICD-10-CM diagnosis codes. 13 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the L40 Range 15 codes · 13 billable
- L40 PsoriasisNon-billable
- L40.0 Psoriasis vulgaris
- L40.1 Generalized pustular psoriasis
- L40.2 Acrodermatitis continua
- L40.3 Pustulosis palmaris et plantaris
- L40.4 Guttate psoriasis
- L40.5 Arthropathic psoriasisNon-billable
- L40.50 Arthropathic psoriasis, unspecified
- L40.51 Distal interphalangeal psoriatic arthropathy
- L40.52 Psoriatic arthritis mutilans
- L40.53 Psoriatic spondylitis
- L40.54 Psoriatic juvenile arthropathy
- L40.59 Other psoriatic arthropathy
- L40.8 Other psoriasis
- L40.9 Psoriasis, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the L40 range.
Arthritis, Psoriatic
A type of inflammatory arthritis associated with PSORIASIS, often involving the axial joints and the peripheral terminal interphalangeal joints. It is characterized by the presence of HLA-B27-associated SPONDYLARTHROPATHY, and the absence of rheumatoid factor.
Guttate Psoriasis
A skin condition, typically emerges suddenly and frequently occurs after an infection such as STREPTOCOCCAL INFECTION. While prevalent among children, it can also manifest in young adults. Its defining feature is the eruption of small, red, scaly patches that typically appear on the arms, legs, and torso.
Psoriasis
A common genetically determined, chronic, inflammatory skin disease characterized by rounded erythematous, dry, scaling patches. The lesions have a predilection for nails, scalp, genitalia, extensor surfaces, and the lumbosacral region. Accelerated epidermopoiesis is considered to be the fundamental pathologic feature in psoriasis.
Streptococcal Infections
Infections with bacteria of the genus STREPTOCOCCUS.
About the L40 Code Range
ICD-10 code L40 categorizes various forms of psoriasis, a chronic inflammatory skin condition characterized by red, scaly patches. These codes help differentiate among specific types such as plaque psoriasis (L40.0), pustular forms (L40.1–L40.4), and psoriatic arthritis (L40.5 series), enabling accurate diagnosis and treatment planning.
The ICD-10 code for psoriasis includes numerous subcodes that clarify the particular type or manifestation. For example, L40.0 covers psoriasis vulgaris, often called plaque psoriasis or chronic stable plaque psoriasis, which presents as thick, silvery plaques. L40.1 identifies generalized pustular psoriasis, sometimes referred to as acute pustular skin eruption, involving widespread pustules. Localized pustular variants like L40.2 (acrodermatitis continua) and L40.3 (pustulosis palmaris et plantaris) involve the hands and feet. Less common forms such as L40.4 (guttate psoriasis) often present with small drop-like lesions. Psoriatic arthritis is specified with codes L40.50 to L40.59, describing joint involvement types including distal interphalangeal arthropathy and juvenile onset. The L40.8 and L40.9 codes cover other or unspecified psoriasis, useful when clinical details are limited or for rare variants. Using these ICD-10 codes for psoriasis ensures precise classification between skin-only and arthropathic forms and aids healthcare providers and coders in selecting the appropriate diagnosis in medical records.
Questions About This Page
How many billable codes are in the L40 range?
Of the 15 codes in this range, 13 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the L40 range classify?
The range classifies psoriasis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
