Psoriasis
Also known as: Psoriasis of unspecified type
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In short
Psoriasis is a skin disease that causes itchy or sore patches of thick, red skin with silvery scales. These patches are usually on the elbows, knees, scalp, back, face, palms, and feet, and some people who have psoriasis also get a form of arthritis called psoriatic arthritis. A problem with the immune system causes skin cells to rise to the surface in just days instead of the normal month. The condition usually occurs in adults, can last a lifetime with symptoms that come and go, and can be made worse by infections, stress, dry skin, and certain medicines. Treatments include creams, medicines, and light therapy.
Source: MedlinePlus, National Library of Medicine.
AI-generated summary of the sources cited on this page, checked automatically against them. Not reviewed by a clinician; not medical advice.
Codes
Description
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.
A problem with your immune system causes psoriasis. In a process called cell turnover, skin cells that grow deep in your skin rise to the surface. Normally, this takes a month. In psoriasis, it happens in just days because your cells rise too fast.
Psoriasis can be hard to diagnose because it can look like other skin diseases. Your doctor might need to look at a small skin sample under a microscope.
Psoriasis can last a long time, even a lifetime. Symptoms come and go. Things that make them worse include:
- Infections
- Stress
- Dry skin
- Certain medicines
Psoriasis usually occurs in adults. It sometimes runs in families. Treatments include creams, medicines, and light therapy.
NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases
Related terms in the cited sources
Medicines with an official indication for this condition
- Adalimumab Treatment
- Apremilast Treatment
- Bimekizumab Treatment
- Brodalumab Treatment
- Deucravacitinib Treatment
- Dimethyl fumarate Treatment
- Etanercept Treatment
- Guselkumab Treatment
- Icotrokinra Treatment
- Infliximab Treatment
- Ixekizumab Treatment
- Methotrexate Treatment
- Risankizumab Treatment
- Secukinumab Treatment
- Spesolimab Treatment
- Tildrakizumab Treatment
- Ustekinumab Treatment
In alphabetical order.
Next to it in ICD-10
- L21Dandruff, Cradle Cap, and Other Scalp Conditions
- L22Nappy rash (diaper dermatitis)
- L23Allergic contact dermatitis, unspecified
- L45Scaly skin disorders in other diseases
- L55Sunburn, unspecified
- L56Other acute skin changes from sunlight (UV)
Neighbouring codes in the classification, not a medical link.
External resources
Questions
What is the ICD-10 code for Psoriasis?
L40 (WHO, International Classification of Diseases, 10th Revision).
What is the ICD-11 code for Psoriasis?
EA90.Z: Psoriasis of unspecified type (WHO, ICD-11 for Mortality and Morbidity Statistics).
Sources and attribution
- ICD-11 for Mortality and Morbidity Statistics, © World Health Organization, licensed under CC BY-ND 3.0 IGO.
- Source: MedlinePlus, National Library of Medicine.
- Names other than the official source titles: Anpheros translations and plain-language names, made with AI assistance and checked automatically; the source names are in English.
- Source: European Medicines Agency (EMA) — EPAR. © European Medicines Agency.
- ICD-10 codes and titles © World Health Organization. Source: WHO, International Classification of Diseases, 10th Revision (2019).
Anpheros Search catalog 2026.10.5, published 17 October 2026. About the data →
About this page. This page brings together public information from official sources, each cited where it is used. It is not medical advice, it is not a diagnosis, and it does not tell you which treatment to take.
Treatments. Indications are quoted unchanged from official product information (European Medicines Agency, U.S. Food and Drug Administration). They describe what a medicine is approved for, not whether it is right for you. Approved uses can differ between countries. Always read the package leaflet and follow your doctor's or pharmacist's advice.
What people report. Figures marked "reported by Anpheros users" are anonymous counts from at least 20 people who agreed to share them. They show what people report, not what works, and they are not clinical evidence.
Links between terms. "May be associated with" means the link appears in a cited source. It does not mean you have that condition.
In an emergency, call 112 (or your local emergency number). Do not delay seeking medical help because of something you read here.