G47.12 – Idiopathic hypersomnia without long sleep time

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

Billable code

ICD-10-CM code G47.12

Code: G47.12 (claims format: G4712)
Description: Idiopathic hypersomnia without long sleep time
Billable: Yes – valid for HIPAA-covered transactions
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 › G47.1

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)

G47.1 – Hypersomnia

Excludes2 (not included here):

alcohol-related hypersomnia (F10.182, F10.282, F10.982)
drug-related hypersomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
hypersomnia due to a mental disorder (F51.13)
hypersomnia not due to a substance or known physiological condition (F51.1-)
primary hypersomnia (F51.11)
sleep apnea (G47.3-)

Index terms for G47.12

Entries in the ICD-10-CM alphabetic index that lead to this code:

Hypersomnia, idiopathic, without long sleep time

Related codes in G47.1

G47.10 – Hypersomnia, unspecifiedBillable
G47.11 – Idiopathic hypersomnia with long sleep timeBillable
G47.13 – Recurrent hypersomniaBillable
G47.14 – Hypersomnia due to medical conditionBillable
G47.19 – Other hypersomniaBillable

Frequently asked questions

What is ICD-10 code G47.12?

G47.12 is the ICD-10-CM code for idiopathic hypersomnia without long sleep time, in the block G40-G47 (Episodic and paroxysmal disorders).

Is G47.12 a billable code?

Yes. G47.12 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does G47.12 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.