I66.4: Occlusion and stenosis of multiple and bilateral cerebral arteries

More than one artery in your brain has narrowed or got blocked.

In the brain there are various arteries that supply blood to the brain tissue. More than one of your cerebral arteries has narrowed or got blocked.

There are various reasons why arteries narrow or get blocked like this. For example, fats and calcium may be deposited in the blood vessel wall. The blood vessel narrows as a result. Then sometimes not enough blood can flow through any longer. Or the artery can be blocked by a blood clot. The blood clot can form in the heart or somewhere else in the body. The blood clot can then be swept towards the brain along with the blood.

Various risk factors can favor the blocking of an artery. These include, for example, smoking, obesity, and high blood pressure.

When an artery gets blocked or narrows, it can cause various problems. However, there may be no symptoms at all.

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.


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