2026 ICD-10-CM Diagnosis Code F51Sleep disorders not due to a substance or known physiological condition

ICD-10-CM Codes›F01–F99›F50-F59›F51

ICD-10-CM F51
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F51 is a non-billable ICD-10-CM category code for sleep disorders not due to a substance or known physiological condition, so it cannot be submitted on claims. Use a more specific code from this category instead, such as F51.01, F51.02, F51.03, and F51.04.

Code Identity

ICD-10-CM Code
F51
Billable Status
No — Non-Billable Category
Code Describes
Sleep disorders not due to a substance or known physiological condition
Short Description
Sleep disorders not due to a substance or known physiol cond
Chapter
F50-F59
Behavioral syndromes associated with physiological disturbances and physical factors

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF50-F59Behavioral syndromes associated with physiological disturbances and physical factors
CategoryF51Sleep disorders not due to a substance or known physiological condition
This CodeF51Sleep disorders not due to a substance or known physiological condition

Specific Coding for Sleep disorders not due to a substance or known physiol condOverview

Non-specific codes like F51 require more characters. Use one of these billable codes instead:

  • F51.0 for Insomnia not due to a substance or known physiological condition

  • Use F51.01 for Primary insomnia

  • Use F51.02 for Adjustment insomnia

  • Use F51.03 for Paradoxical insomnia

  • Use F51.04 for Psychophysiologic insomnia

  • Use F51.05 for Insomnia due to other mental disorder

  • Use F51.09 for Other insomnia not due to a substance or known physiological condition

  • F51.1 for Hypersomnia not due to a substance or known physiological condition

  • Use F51.11 for Primary hypersomnia

  • Use F51.12 for Insufficient sleep syndrome

  • Use F51.13 for Hypersomnia due to other mental disorder

  • Use F51.19 for Other hypersomnia not due to a substance or known physiological condition

  • Use F51.3 for Sleepwalking [somnambulism]

  • Use F51.4 for Sleep terrors [night terrors]

  • Use F51.5 for Nightmare disorder

  • Use F51.8 for Other sleep disorders not due to a substance or known physiological condition

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

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 2 Excludes

  • organic sleep disorders G47

Patient EducationClinical

Sleep Disorders

Sleep is a complex biological process. While you are sleeping, you are unconscious, but your brain and body functions are still active. They are doing a number of important jobs that help you stay healthy and function at your best. So when you don't get enough quality sleep, it does more than just make you feel tired.

The full article covers:

  • What is sleep?
  • What are sleep disorders?
  • What causes sleep disorders?
  • What are the symptoms of sleep disorders?
  • How are sleep disorders diagnosed?
  • What are the treatments for sleep disorders?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F51Overview

Is F51 a billable code?

No. This is a category header that groups the codes for sleep disorders not due to a substance or known physiological condition, and headers cannot be submitted on claims. Claims for sleep disorders not due to a substance or known physiological condition need a more specific code from this category, such as F51.01, F51.02, and F51.03.