G56.0: Carpal tunnel syndrome

The passageway for a nerve in your wrist has narrowed.

Your carpal tunnel is too narrow. The carpal tunnel is a tunnel-like passageway in the wrist. It is made up of bone and ligaments.

The carpal tunnel is in the wrist on the side where the palm of the hand is. The tendons of some finger muscles and a nerve run through the carpal tunnel. These nerves enable us to move our thumb and flex our fingers. The nerve is also responsible for sensation in the thumb, the index finger and the middle finger.

The carpal tunnel in your wrist has narrowed. As a result, the nerve is being compressed in the carpal tunnel. This can cause, for example, pain, tingling or numbness in one’s hand. The symptoms often occur at night. It may also no longer be possible to move the fingers as well as normal.

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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