B35.1: Tinea unguium

Your skin has been inflamed by fungi. This is why your nails have changed, too.

Many different germs, mainly bacteria, are found on normal skin. There is normally a certain balance between them. Many of these germs are also beneficial for the skin.

Certain fungi have spread over your skin. These fungi could come from a person, an animal or from the earth.

When the skin is affected by these fungi, round, red spots usually appear on the skin. The skin around the edges of those spots is often scaly and darker. The skin is sometimes itchy.

The fungi have attacked your nails. Your nails might turn a yellow or brown color, for example. Nails often become brittle, too, and afterwards they no longer grow properly.

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).