G47.421: Narcolepsy in conditions classified elsewhere with cataplexy
G47.421 is the billable ICD-10-CM diagnosis code for Narcolepsy in conditions classified elsewhere with cataplexy. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code G47.421?
G47.421 is the ICD-10-CM diagnosis code for Narcolepsy in conditions classified elsewhere with cataplexy. It belongs to category G47 (Sleep disorders).
Is G47.421 a billable code?
Yes. G47.421 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does G47.421 belong to?
G47.421 is part of ICD-10-CM category G47 — Sleep disorders, which has 86 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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