Other hypersomnia

This code signifies a chronic neurological sleep disorder characterized by excessive daytime sleepiness or prolonged nighttime sleep that is not attributable to insufficient sleep, another medical condition, medication side effects, or a mental disorder. Patients experience an overwhelming urge to sleep during the day, often despite adequate or even extended sleep at night, and may have difficulty waking up.

Assign this code when documentation clearly indicates a diagnosis of hypersomnia that does not meet the criteria for narcolepsy, Kleine-Levin syndrome, or hypersomnia due to a known medical condition or substance. This diagnosis is typically made after a comprehensive sleep evaluation, including polysomnography and multiple sleep latency tests (MSLT), which rule out other causes of excessive somnolence.

• Ensure documentation specifies that other causes of hypersomnia (e.g., insufficient sleep, drug-induced, medical condition) have been ruled out.
• Do not use this code for narcolepsy (G47.4-) or Kleine-Levin syndrome (G47.13).
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, especially for sleep disorder evaluations or management.