E21.2: Other hyperparathyroidism

Your parathyroid glands are overworking. As a result, you have too many messenger substances (hormones) of the parathyroid glands in your body.

The parathyroid glands are 4 small glands at the edge of the thyroid gland. A messenger substance is formed in the parathyroid glands. This messenger substance affects the calcium and phosphate content in the body. Calcium from the bone is dissolved by the messenger substance and released into the blood. It thus also affects bone firmness.

Various causes can lead to excess production of messenger substances. That may occur for instance after a medical examination or treatment. Diseases in the brain can also cause the parathyroid glands to work more than normally.

If you have too many messenger substances of the parathyroid gland in your blood, the calcium content in your blood may rise. At the same time, calcium is released from the bones. Then bone pain and joint pain may occur, for example. The bones can even become deformed. Other symptoms like a stomach ache or kidney stones may occur.

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).