---
title: "ICD-10-CM F51.11: Primary hypersomnia | BillingBrief"
description: "F51.11 covers primary hypersomnia the provider documents as not due to a substance or a known physiological condition. Hypersomnia linked to another mental…"
canonical: "https://billingbrief.com/icd10/f51.11/"
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---

# F51.11 Primary hypersomnia

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

F51.11 covers primary hypersomnia the provider documents as not due to a substance or a known physiological condition. Hypersomnia linked to another mental disorder has its own code, F51.13.

## 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 NOS ([G47.10](https://billingbrief.com/icd10/g47.10/))
-   hypersomnia due to known physiological condition ([G47.10](https://billingbrief.com/icd10/g47.10/))
-   idiopathic hypersomnia ([G47.11](https://billingbrief.com/icd10/g47.11/), [G47.12](https://billingbrief.com/icd10/g47.12/))
-   narcolepsy (G47.4-)
-   organic sleep disorders (G47.-)

## Related codes

-   [`F51.03` Paradoxical insomnia ICD-10-CM](https://billingbrief.com/icd10/f51.03/)
-   [`F51.04` Psychophysiologic insomnia ICD-10-CM](https://billingbrief.com/icd10/f51.04/)
-   [`F51.05` Insomnia due to other mental disorder ICD-10-CM](https://billingbrief.com/icd10/f51.05/)
-   [`F51.09` Other insomnia not due to a substance or known physiological condition ICD-10-CM](https://billingbrief.com/icd10/f51.09/)
-   [`F51.12` Insufficient sleep syndrome ICD-10-CM](https://billingbrief.com/icd10/f51.12/)
-   [`F51.13` Hypersomnia due to other mental disorder ICD-10-CM](https://billingbrief.com/icd10/f51.13/)
-   [`F51.19` Other hypersomnia not due to a substance or known physiological condition ICD-10-CM](https://billingbrief.com/icd10/f51.19/)
-   [`F51.3` Sleepwalking \[somnambulism\] ICD-10-CM](https://billingbrief.com/icd10/f51.3/)

## Common questions

### Is F51.11 a billable code?

Yes. F51.11 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

F51 Sleep disorders not due to a substance or known physiological condition

Chapter

Mental, behavioral and neurodevelopmental disorders

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/).