H55: Nystagmus and other irregular eye movements

Your eyes are moving involuntarily.

These movements may only occur on one side or with both eyes. There may be various reasons why the eyes move involuntarily. These eye movements may be from birth or caused by another condition, for example.

The movements can be jerky and go in different directions. The eyes can involuntarily move to the side or upwards or downwards, 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).