ICD-10 Code G47.411 – Narcolepsy with cataplexy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G47.411 – Narcolepsy with cataplexy
What it is
G47.411 identifies narcolepsy when cataplexy is present. Use it for a sleep-wake disorder marked by excessive daytime sleepiness and sudden loss of muscle tone triggered by emotion.
Clinical signs
Common findings include irresistible daytime sleepiness, brief sleep attacks, and cataplexy such as jaw slackening, head drop, or collapse with preserved consciousness. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents narcolepsy with cataplexy, or records narcolepsy type 1. It fits confirmed cases where cataplexy is part of the diagnosis. Check documentation if the chart only mentions hypersomnia, fatigue, or suspected narcolepsy.
Do not use for
Do not use this code for narcolepsy without cataplexy, other sleep disorders, or nonspecific daytime sleepiness. Check documentation when the record does not clearly state cataplexy.
Coding tip
Code cataplexy only when the provider explicitly links it to narcolepsy in the record.