L99.0: Amyloidosis of skin

You have proteins building up in your skin that don’t belong there.

The body needs proteins for many different tasks. For example, proteins are used as messenger substances or are required for the body’s immune system. Many organs or the muscles also consist of proteins.

The protein deposits cause changes in the skin. Dark patches, small papules or fairly large nodules appear as well as changed areas that are higher than the surrounding skin. The skin changes can be skin-colored to gray or brown and be itchy.

They are mainly found on the upper body and on the fronts of the legs and backs of the arms.

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).