Narcolepsy in conditions classified elsewhere w/o cataplexy

This code identifies a chronic neurological disorder characterized by overwhelming daytime sleepiness and an uncontrollable urge to sleep, specifically when the underlying cause is another medical condition. Crucially, this diagnosis excludes the presence of cataplexy, which is a sudden loss of muscle tone triggered by strong emotions. The sleep disturbance is secondary to a primary, separately classified disease.

Use this code when documentation clearly indicates narcolepsy without cataplexy, and the provider has identified an underlying medical condition responsible for the narcoleptic symptoms. This typically applies to cases where the narcolepsy is a manifestation of another neurological disorder, autoimmune disease, or genetic syndrome. Supporting documentation should specify the absence of cataplexy and the associated primary condition.

• Always code the underlying condition first, as this narcolepsy is "in conditions classified elsewhere."
• Ensure the documentation explicitly states "without cataplexy" to differentiate from other narcolepsy types.
• Do not use this code for primary narcolepsy or narcolepsy with cataplexy, which have distinct codes.