ICD10 code of Kleine-Levin syndrome and ICD9 code

Kleine-Levin syndrome is classified under the ICD-10-CM code G47.14 (recurrent hypersomnia), while the now-deprecated ICD-9-CM code for the condition was 347.11. These diagnostic codes are essential for medical billing and clinical documentation, though they reflect the broader category of recurrent hypersomnia rather than being unique to Kleine-Levin syndrome alone.

What exactly is Kleine-Levin syndrome?

Kleine-Levin syndrome, often referred to as "Sleeping Beauty syndrome," is a rare neurological sleep disorder characterized by recurring periods of excessive sleepiness and altered behavior. Patients with Kleine-Levin syndrome may sleep for up to 20 hours a day during an episode, which can last anywhere from a few days to several weeks. Between these episodes, individuals with Kleine-Levin syndrome typically return to normal sleep patterns and cognitive function. Currently, 13 people with Kleine-Levin syndrome have joined the DiseaseMaps community to share their experiences and navigate the diagnostic challenges associated with this condition.

How is Kleine-Levin syndrome diagnosed?

Because there is no single blood test or genetic marker to confirm the diagnosis, identifying Kleine-Levin syndrome is a process of exclusion. Clinicians must rule out other potential causes of hypersomnia, such as narcolepsy, psychiatric disorders, or metabolic conditions. A formal diagnosis of Kleine-Levin syndrome usually requires a detailed history of recurrent episodes involving hypersomnia, cognitive impairment (such as confusion or feelings of unreality), and behavioral changes. Specialists often utilize sleep studies, such as polysomnography, to ensure that the sleep patterns do not align with other sleep-wake disorders.

What are the core clinical features of Kleine-Levin syndrome?

The clinical presentation of Kleine-Levin syndrome is distinct and episodic. While the primary hallmark is excessive sleepiness, the condition significantly impacts a person's quality of life during active phases. Common symptoms include:

• Hypersomnia: Extreme sleep duration, often punctuated by grogginess or difficulty waking.


• Cognitive Impairment: Feelings of derealization, confusion, and memory lapses.


• Hyperphagia: Compulsive, excessive eating during waking hours of an episode.


• Behavioral Changes: Irritability, apathy, or hypersexuality, which are frequently reported by families.


• Mood Disturbances: Anxiety or depression during or immediately following an episode.

Is there a genetic component to Kleine-Levin syndrome?

Research into the etiology of Kleine-Levin syndrome is ongoing. While the exact cause remains unknown, clinical researchers have observed a potential genetic predisposition in some families. However, Kleine-Levin syndrome does not follow a clear Mendelian inheritance pattern, suggesting that environmental factors, immune system dysfunction, or complex multi-gene interactions may play a role. The rarity of the condition makes large-scale genetic studies difficult, but ongoing international research continues to look for biomarkers that could improve the speed and accuracy of diagnosis.

Next steps

• Consult a neurologist or a board-certified sleep specialist who has experience with rare hypersomnias.


• Maintain a detailed "sleep diary" to track the frequency, duration, and specific symptoms of your episodes to assist your physician.


• Connect with the 13 members on DiseaseMaps.org to share coping strategies and find support from others living with Kleine-Levin syndrome.


• Stay informed about current research and potential clinical trials through the NIH Genetic and Rare Diseases (GARD) Information Center.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the guidance of a qualified healthcare provider with any questions regarding a medical condition.

References

• National Institutes of Health (NIH) - Genetic and Rare Diseases (GARD) Information Center: Kleine-Levin syndrome.


• Orphanet: Rare disease portal for Kleine-Levin syndrome (ORPHA:485).


• OMIM (Online Mendelian Inheritance in Man): Kleine-Levin syndrome entry (#105500).


• Kleine-Levin Syndrome Foundation: Patient-centered resources and support.