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M65.4: Radial styloid tenosynovitis [de Quervain]

You have a tendon inflammation in your thumb.

A tendon sheath inflammation may involve inflammation of the tendon and the associated tendon sheath. Tendons are made up of very firm connective tissue. Tendons attach muscles to bones. A tendon sheath is a covering for the tendon. It cushions the tendon and contains a small amount of fluid. This reduces friction between the tendon and its surroundings.

Tendon and tendon sheath inflammations can be caused by excess use or repetitive movements. The inflammation can cause scars and adhesions. As a result, the tendons are no longer able to glide in the tendon sheaths so well.

Moving the thumb may then become painful. The pain can also spread to the wrist and arm. There may also be a loss of mobility in the thumb. Your grip may then be weaker than usual.

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

Note

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.

Source

Provided by the non-profit organization “Was hab’ ich?” gemeinnützige GmbH on behalf of the Federal Ministry of Health (BMG).