G11.9: Hereditary ataxia, unspecified

You have a condition that means you cannot control movements properly.

You have a disorder in parts of your nervous system that are important in controlling movements. Depending on the nature of the condition, the cerebellum, the spinal column or nerves in the body may be affected. The cerebellum is part of the brain. The cerebellum is important for movement and balance. The cerebellum stores movement processes, for example, how one eats with cutlery or rides a bike.

The condition prevents you from executing movements with precision. For example, you may be unable to walk properly. You may also be unable to balance properly. Speech may also be affected. You may also be unable to control your eye movements properly. Depending on the nature of the condition, other problems can also occur.

The disease is hereditary. Other family members may also be affected.

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).