G20.11: Primary Parkinson disease with moderate to severe impairment With fluctuations

You have Parkinson’s disease.

With Parkinson’s, there is too little of the messenger substance dopamine in certain parts of the brain. The messenger dopamine is important in controlling the body’s movements, for example. A lack of the messenger dopamine makes movements more difficult. The person can then no longer execute certain movements as quickly as normal. As a result, keeping one’s balance may also become difficult. The muscles may also stiffen up. The hands often shake.

You have symptoms from the Parkinson’s. During the course of a day, the symptoms from your Parkinson’s vary from more severe to less severe.

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).