ICD-10-CM 2027 diagnosis code

G47.4Narcolepsy and cataplexy

Not billable — use a more specific code

G47.4 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G47.4

G47.4 is the ICD-10-CM diagnosis code for Narcolepsy and cataplexy. It belongs to category G47 (sleep disorders), block G40-G47 (episodic and paroxysmal disorders) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within G47 (sleep disorders), G47.4 is specifically for Narcolepsy and cataplexy. Related codes cover insomnia (G47.0), hypersomnia (G47.1), circadian rhythm sleep disorders (G47.2), sleep apnea (G47.3), parasomnia (G47.5), sleep related movement disorders (G47.6), other sleep disorders (G47.8) and sleep disorder, unspecified (G47.9).

To report this condition, pick the subcode that matches the documentation: G47.41 (Narcolepsy) and G47.42 (elsewhere).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under G47.4

Notes that apply from higher levels

Instructions written at a parent level also apply to G47.4.

› From G47 Sleep disorders

Excludes2

nightmares (F51.5)
nonorganic sleep disorders (F51.-)
sleep terrors (F51.4)
sleepwalking (F51.3)

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

Codes whose notes reference G47.4

F51.1Excludes2

Code history

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2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about G47.4

Is G47.4 billable?: No. G47.4 is a header code. Report one of its more specific subcodes instead.