G47.421Billable
Narcolepsy in conditions classified elsewhere with cataplexy
- Chapter
- 6. Diseases of the nervous system
- Category
- G47
- Effective date
- October 1, 2026
Related codes in category G47
G47Sleep disordersG47.0InsomniaG47.00Insomnia, unspecifiedYesG47.01Insomnia due to medical conditionYesG47.09Other insomniaYesG47.1HypersomniaG47.10Hypersomnia, unspecifiedYesG47.11Idiopathic hypersomnia with long sleep timeYesG47.12Idiopathic hypersomnia without long sleep timeYesG47.13Recurrent hypersomniaYesG47.14Hypersomnia due to medical conditionYesG47.19Other hypersomniaYes
Frequently asked questions
What is ICD-10 code G47.421?
G47.421 is an ICD-10-CM diagnosis code for Narcolepsy in conditions classified elsewhere with cataplexy.
Is G47.421 a billable code?
Yes. G47.421 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is G47.421 in?
G47.421 falls under Chapter 6: Diseases of the nervous system.
When did G47.421 become effective?
G47.421 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to G47.421?
G47.421 belongs to category G47, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.