R40.0: Somnolence

If a person’s consciousness is disordered, they will be in an abnormal, sleep-like state. The person is then not properly awake. However, if the person is addressed loudly or shaken, they can be woken up again. It may be that in this state the person is unable to say where they are or what day it is.

One’s consciousness can be disordered if the brain is not functioning properly. For various reasons, the brain is no longer able to function properly. The brain may have been damaged. The brain can be damaged by injury, pathogens or other diseases, for example.

Patient Disclaimer

The information provided on this page is for general educational purposes only. It is not intended for self-diagnosis and does not replace professional medical advice. Always consult your doctor or a qualified healthcare provider with any questions or concerns about your health.

If you see an ICD diagnosis code (e.g., on a medical report), be aware that doctors may also include additional indicators to express diagnostic certainty. Only a healthcare professional can interpret these codes accurately in the context of your individual case.

For a complete understanding of your condition and what the diagnosis means for you, please speak directly with your doctor.