ICD-10 Diagnosis Code R40

Somnolence, stupor and coma

Diagnosis Code R40

ICD-10: R40
Short Description: Somnolence, stupor and coma
Long Description: Somnolence, stupor and coma
This is the 2017 version of the ICD-10-CM diagnosis code R40

Code Classification
  • Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
    • Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)
      • Somnolence, stupor and coma (R40)

Information for Medical Professionals

According to ICD-10-CM guidelines this code should not to be used as a principal diagnosis code when a related definitive diagnosis has been established.
Index of Diseases and Injuries
References found for the code R40 in the Index of Diseases and Injuries:

Information for Patients


A coma is a deep state of unconsciousness. An individual in a coma is alive but unable to move or respond to his or her environment. Coma may occur as a complication of an underlying illness, or as a result of injuries, such as brain injury.

A coma rarely lasts more than 2 to 4 weeks. The outcome for coma depends on the cause, severity, and site of the damage. People may come out of a coma with physical, intellectual, and psychological problems. Some people may remain in a coma for years or even decades. For those people, the most common cause of death is infection, such as pneumonia.

NIH: National Institute of Neurological Disorders and Stroke

  • EEG

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Sleep Disorders

Is it hard for you to fall asleep or stay asleep through the night? Do you wake up feeling tired or feel very sleepy during the day, even if you have had enough sleep? You might have a sleep disorder. The most common kinds are

  • Insomnia - a hard time falling or staying asleep
  • Sleep apnea - breathing interruptions during sleep
  • Restless legs syndrome - a tingling or prickly sensation in the legs
  • Narcolepsy - daytime "sleep attacks"

Nightmares, night terrors, sleepwalking, sleep talking, head banging, wetting the bed and grinding your teeth are kinds of sleep problems called parasomnias. There are treatments for most sleep disorders. Sometimes just having regular sleep habits can help.

  • Changing your sleep habits
  • Drowsiness
  • Idiopathic hypersomnia
  • Irregular sleep-wake syndrome
  • Isolated sleep paralysis
  • Medicines for sleep
  • Narcolepsy
  • Nightmares
  • Sleep and your health
  • Sleep disorders
  • Teenagers and sleep

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