M51.4: Schmorl nodes

Tissue from one of your intervertebral discs has penetrated into a vertebra.

An intervertebral disc is like a cushion between two adjacent vertebrae of the vertebral column. The intervertebral discs cushion pressure. As a result, less strain is placed on the vertebrae. The intervertebral discs also allow the vertebral column to move. An intervertebral disc consists of a firm ring with a soft core.

Tissue from an intervertebral disc can get into the vertebrae if the vertebrae have changed. This can occur when growing, for example, or when under heavy strain for a long period. This can affect one or more discs.

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).