I80.3: Phlebitis and thrombophlebitis of lower extremities, unspecified

The veins in your leg are inflamed or they have been blocked by blood clots.

The veins carry the blood to the heart from the body. The veins in your leg are inflamed or blood clots have formed.

If the veins get blocked by blood clots, the blood is unable to flow properly. Then, as a result of the blocked veins, the skin can turn red and swell up. There are various reasons for blood clots forming. If someone is unable to move their legs properly, or if the vascular wall has been injured, a blood clot can form more quickly. Some people are prone to blood clots. This is then congenital or caused by another disorder. Inflammations in the veins can also favor the formation of blood clots.

Veins can become inflamed for different reasons. The veins can be inflamed by pathogens, 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.


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