R21: Rash and other nonspecific skin eruption

You have a rash.

The appearance of a rash can vary greatly. Often the skin is reddened. Sometimes the skin becomes discolored or sores form on the skin.

There are many different reasons for a rash. You may not be able to tolerate certain foods or medicines, for example. Various illnesses can also cause a rash. These include inflammation from pathogens, for example.

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).