---
title: "ICD-10-CM G47.12: Idiopathic hypersomnia without long… | BillingBrief"
description: "ICD-10-CM code G47.12: Idiopathic hypersomnia without long sleep time. Category, related codes, and the official source, in plain English."
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language: "en"
---

# G47.12 Idiopathic hypersomnia without long sleep time

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Idiopathic hypersomnia without long sleep time

## 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.

-   alcohol-related hypersomnia ([F10.182](https://billingbrief.com/icd10/f10.182/), [F10.282](https://billingbrief.com/icd10/f10.282/), [F10.982](https://billingbrief.com/icd10/f10.982/))
-   drug-related hypersomnia ([F11.182](https://billingbrief.com/icd10/f11.182/), [F11.282](https://billingbrief.com/icd10/f11.282/), [F11.982](https://billingbrief.com/icd10/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](https://billingbrief.com/icd10/f51.13/))
-   hypersomnia not due to a substance or known physiological condition (F51.1-)
-   primary hypersomnia ([F51.11](https://billingbrief.com/icd10/f51.11/))
-   sleep apnea (G47.3-)
-   nightmares ([F51.5](https://billingbrief.com/icd10/f51.5/))
-   nonorganic sleep disorders (F51.-)
-   sleep terrors ([F51.4](https://billingbrief.com/icd10/f51.4/))
-   sleepwalking ([F51.3](https://billingbrief.com/icd10/f51.3/))

## Related codes

-   [`G47.01` Insomnia due to medical condition ICD-10-CM](https://billingbrief.com/icd10/g47.01/)
-   [`G47.09` Other insomnia ICD-10-CM](https://billingbrief.com/icd10/g47.09/)
-   [`G47.10` Hypersomnia, unspecified ICD-10-CM](https://billingbrief.com/icd10/g47.10/)
-   [`G47.11` Idiopathic hypersomnia with long sleep time ICD-10-CM](https://billingbrief.com/icd10/g47.11/)
-   [`G47.13` Recurrent hypersomnia ICD-10-CM](https://billingbrief.com/icd10/g47.13/)
-   [`G47.14` Hypersomnia due to medical condition ICD-10-CM](https://billingbrief.com/icd10/g47.14/)
-   [`G47.19` Other hypersomnia ICD-10-CM](https://billingbrief.com/icd10/g47.19/)
-   [`G47.20` Circadian rhythm sleep disorder, unspecified type ICD-10-CM](https://billingbrief.com/icd10/g47.20/)

## Common questions

### Is G47.12 a billable code?

Yes. G47.12 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

G47 Sleep disorders

Chapter

Diseases of the nervous system

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).