ICD-10 Code G47.41 – Narcolepsy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G47.41 – Narcolepsy
What it is
Narcolepsy is a chronic sleep disorder marked by excessive daytime sleepiness and sudden sleep attacks. You use this code when documentation identifies narcolepsy as the diagnosed cause of abnormal sleepiness.
Clinical signs
Typical findings include irresistible daytime sleepiness, brief sleep episodes, and disrupted nighttime sleep. Clinical features vary; refer to documentation for cataplexy, sleep paralysis, or hallucinations if present.
When to use this code
Use G47.41 when the provider documents narcolepsy as the confirmed diagnosis, including cases evaluated by sleep medicine or neurology. Apply it for outpatient, inpatient, or problem-list documentation when the condition is being actively assessed or managed.
Do not use it for nonspecific fatigue, insomnia, or sleep deprivation without a documented narcolepsy diagnosis. If the record does not clearly identify the sleep disorder, check documentation before coding.
Do not use for
Do not use this code for general hypersomnia, daytime tiredness, or poor sleep from other causes. Check documentation if the chart mentions another sleep disorder or if narcolepsy is only suspected.
Coding tip
Confirm that narcolepsy is explicitly documented, and capture any associated features only when the record supports them.