L40.5: Arthropathic psoriasis

You have psoriasis. As a result, your skin is constantly inflamed and very scaly.

When someone has psoriasis, the body’s own immune system is often not working properly. That is usually congenital, which means you were born with it. Several family members are often affected by the condition. Sometimes psoriasis is caused by contact with pathogens or by injuries to the skin. The body then quickly creates too much new skin. The skin also becomes inflamed. The areas affected then become red and are very scaly. The nails may also change.

You have one or more joints that are affected by psoriasis. This condition can also involve joint inflammation before the skin lesions appear.

The psoriasis can persist lifelong. Stress, or certain medications, for example, can make the condition worse. The psoriasis may also have psychological effects.

Additional indicator

On medical documents, the ICD code is often appended by letters that indicate the diagnostic certainty or the affected side of the body.

  • G: Confirmed diagnosis
  • V: Tentative diagnosis
  • Z: Condition after
  • A: Excluded diagnosis
  • L: Left
  • R: Right
  • B: Both sides

Further information


This information is not intended for self-diagnosis and does not replace professional medical advice from a doctor. If you find an ICD code on a personal medical document, please also note the additional indicator used for diagnostic confidence.
Your doctor will assist you with any health-related questions and explain the ICD diagnosis code to you in a direct consultation if necessary.


Provided by the non-profit organization “Was hab’ ich?” gemeinnützige GmbH on behalf of the Federal Ministry of Health (BMG).