NPI Atlas

G47.4 – Narcolepsy and cataplexy

ICD-10-CM 2027 diagnosis code · Episodic and paroxysmal disorders

Non-billable header

ICD-10-CM code G47.4

Code: G47.4 (claims format: G474)
Description: Narcolepsy and cataplexy
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 6. Diseases of the nervous system (G00-G99)
Block: G40-G47 Episodic and paroxysmal disorders
Parent codes: G47

Billable codes under G47.4

G47.4 is a header code and cannot be used on claims. Choose the most specific code:

G47.41 – NarcolepsyHeader (more codes below)
G47.42 – Narcolepsy in conditions classified elsewhereHeader (more codes below)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

G47 – Sleep disorders

Excludes2 (not included here):

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

Related codes in G47

G47.0 – InsomniaHeader
G47.1 – HypersomniaHeader
G47.2 – Circadian rhythm sleep disordersHeader
G47.3 – Sleep apneaHeader
G47.5 – ParasomniaHeader
G47.6 – Sleep related movement disordersHeader
G47.8 – Other sleep disordersBillable
G47.9 – Sleep disorder, unspecifiedBillable

Frequently asked questions

What is ICD-10 code G47.4?

G47.4 is the ICD-10-CM code for narcolepsy and cataplexy, in the block G40-G47 (Episodic and paroxysmal disorders).

Is G47.4 a billable code?

No. G47.4 is a header code with more specific child codes; report one of the billable codes listed above.

What category does G47.4 belong to?

It belongs to category G47 – Sleep disorders.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.