G47.421 Narcolepsy in conditions classified elsewhere with cataplexy
ICD-10-CM · CMS code reference
Official ICD-10-CM description: Narcolepsy in conditions classified elsewhere with cataplexy
Coding notes
From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.
Excludes2
Not part of this code, but both can be coded when both are documented.
Code first
Code the underlying condition first, then this code.
- underlying condition
Related codes
G47.37Central sleep apnea in conditions classified elsewhere ICD-10-CMG47.39Other sleep apnea ICD-10-CMG47.411Narcolepsy with cataplexy ICD-10-CMG47.419Narcolepsy without cataplexy ICD-10-CMG47.429Narcolepsy in conditions classified elsewhere without cataplexy ICD-10-CMG47.50Parasomnia, unspecified ICD-10-CMG47.51Confusional arousals ICD-10-CMG47.52REM sleep behavior disorder ICD-10-CM
Common questions
Is G47.421 a billable code?
Yes. G47.421 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.