H90.4: Sensorineural hearing loss, unilateral with unrestricted hearing on the contralateral side

You can no longer hear very well in one or both ears.

The ear consists of 3 sections: the outer ear, the middle ear, and the inner ear. Noise or sound from the world around us reach our ear as sound waves. These sound waves first go to the eardrum via the outer auditory canal. The sound waves make the eardrum vibrate. The ossicles pass this vibration on to the inner ear. Once passed on, the inner ear and the brain process the vibrations in such a way that we can hear.

You are hearing little or nothing in your ear because the vibration is not being properly processed in your inner ear or your brain. If our inner ear or certain parts of our brain are damaged, we can then no longer hear. There are many reasons for this. For example, the inner ear or brain may have been injured.

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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