2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to F51: its own notes plus those printed at Chapter 5. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • disorders of psychological development

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On F51 itself
  • organic sleep disorders (G47.-)
From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name F51, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming F51: its condition is not part of those codes, and both may be reported when the patient has both.

  • F98 Other behavioral and emotional disorders with onset usually occurring in childhood and adolescence
    sleep disorders not due to a substance or known physiological condition (F51.-)
  • G47 Sleep disorders
    nonorganic sleep disorders (F51.-)

Patient EducationClinical

Sleep Disorders

While you are sleeping your brain and body functions are still active. Sleep is a natural process that helps your body restore energy, supports learning and memory, and keeps you healthy.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

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.