ICD-10 Diagnosis Code R40.0


Diagnosis Code R40.0

ICD-10: R40.0
Short Description: Somnolence
Long Description: Somnolence
This is the 2018 version of the ICD-10-CM diagnosis code R40.0

Valid for Submission
The code R40.0 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99)
    • 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.
Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Cerebral depression in newborn
  • Complaining of somnolence
  • Daytime somnolence
  • Disorders of excessive somnolence
  • Drowsiness of the newborn
  • Drowsy
  • Excessive somnolence
  • Gets drowsiness
  • Intermittent drowsiness
  • Neurological symptom
  • On examination - drowsy
  • Post-ictal drowsiness
  • Post-ictal state
  • Post-radiotherapy somnolence syndrome
  • Somnolence syndrome

Index of Diseases and Injuries
References found for the code R40.0 in the Index of Diseases and Injuries:

Information for Patients

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 good sleep habits can help.

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

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