2026 ICD-10-CM Diagnosis Code L40Psoriasis

ICD-10-CM Codes›L00–L99›L40-L45›L40

ICD-10-CM L40
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L40 is a non-billable ICD-10-CM category code for psoriasis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as L40.0, L40.1, L40.2, and L40.3.

Code Identity

ICD-10-CM Code
L40
Billable Status
No — Non-Billable Category
Code Describes
Psoriasis
Chapter
L40-L45
Papulosquamous disorders

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL40-L45Papulosquamous disorders
CategoryL40Psoriasis
This CodeL40Psoriasis

Specific Coding for PsoriasisOverview

Non-specific codes like L40 require more characters. Use one of these billable codes instead:

  • Use L40.0 for Psoriasis vulgaris

  • Use L40.1 for Generalized pustular psoriasis

  • Use L40.2 for Acrodermatitis continua

  • Use L40.3 for Pustulosis palmaris et plantaris

  • Use L40.4 for Guttate psoriasis

  • L40.5 for Arthropathic psoriasis

  • Use L40.50 for Arthropathic psoriasis, unspecified

  • Use L40.51 for Distal interphalangeal psoriatic arthropathy

  • Use L40.52 for Psoriatic arthritis mutilans

  • Use L40.53 for Psoriatic spondylitis

  • Use L40.54 for Psoriatic juvenile arthropathy

  • Use L40.59 for Other psoriatic arthropathy

  • Use L40.8 for Other psoriasis

  • Use L40.9 for Psoriasis, unspecified

Clinical InformationClinical

  • 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.

Patient EducationClinical

Psoriasis

Psoriasis is a skin disease that causes itchy or sore patches of thick, red skin with silvery scales. You usually get the patches on your elbows, knees, scalp, back, face, palms and feet, but they can show up on other parts of your body. Some people who have psoriasis also get a form of arthritis called psoriatic arthritis.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L40Overview

Is L40 (Psoriasis) a billable code?

No. This is a category header that groups the codes for psoriasis, and headers cannot be submitted on claims. Claims for psoriasis need a more specific code from this category, such as L40.0, L40.1, and L40.2.