Recurrent hypersomnia

This code represents a rare neurological sleep disorder characterized by episodes of excessive daytime sleepiness (hypersomnia) that recur periodically, often lasting days to weeks. These episodes are typically accompanied by cognitive dysfunction, behavioral changes, and sometimes hyperphagia or hypersexuality, with symptom-free intervals between episodes.

Use this code when documentation clearly indicates a diagnosis of recurrent hypersomnia, such as Kleine-Levin Syndrome (KLS). Supporting documentation should detail the episodic nature of hypersomnia, associated symptoms during episodes, and the presence of symptom-free intervals. This code is appropriate when the condition is chronic and characterized by these recurring episodes.

• Differentiate from chronic hypersomnia (G47.10) which lacks the episodic nature and symptom-free intervals.
• Ensure documentation specifies "recurrent" or "episodic" hypersomnia to support this code.
• Code any associated symptoms (e.g., hyperphagia, cognitive impairment) separately if they are significant and documented.