---
title: "ICD-10-CM F51.9: Sleep disorder not due to a substance or… | BillingBrief"
description: "F51.9 is a sleep disorder documented without a type, including emotional sleep disorder NOS (not otherwise specified). A named type goes to its own code:…"
canonical: "https://billingbrief.com/icd10/f51.9/"
language: "en"
---

# F51.9 Sleep disorder not due to a substance or known physiological condition, unspecified

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

F51.9 is a sleep disorder documented without a type, including emotional sleep disorder NOS (not otherwise specified). A named type goes to its own code: insomnia F51.01 to F51.09, hypersomnia F51.11 to F51.19, sleepwalking F51.3, sleep terrors F51.4, nightmares F51.5.

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Also covers

-   Emotional sleep disorder NOS

### Excludes2

Not part of this code, but both can be coded when both are documented.

-   organic sleep disorders (G47.-)

## Related codes

-   [`F51.11` Primary hypersomnia ICD-10-CM](https://billingbrief.com/icd10/f51.11/)
-   [`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/)
-   [`F51.4` Sleep terrors \[night terrors\] ICD-10-CM](https://billingbrief.com/icd10/f51.4/)
-   [`F51.5` Nightmare disorder ICD-10-CM](https://billingbrief.com/icd10/f51.5/)
-   [`F51.8` Other sleep disorders not due to a substance or known physiological condition ICD-10-CM](https://billingbrief.com/icd10/f51.8/)

## Common questions

### Is F51.9 a billable code?

Yes. F51.9 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/).