L42: Pityriasis rosea

You have a skin condition where many reddish patches are formed.

This skin condition is also known as pityriasis rosea. Before the first reddish patches of skin appear, you may have other symptoms such as tiredness, headache and fever. The first sign is often an isolated roundish, reddish patch that forms on the skin. The spot has a clearly recognizable edge. There may be fine scales on the surface. Many more similar-looking patches appear after a while. The reddish patches can either itch or cause no discomfort. They are able to heal on their own after a while.

The pityriasis rosea mainly appears on the upper body. However, it can also affect other areas of the body such as upper arms and thighs.

The cause of pityriasis rosea has yet to be resolved. However, it is believed that pathogens such as viruses, among other things, can cause this condition.

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).