Sleep disorders not due to a substance or known physiological condition
In Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59), chapter 5: Mental, Behavioral and Neurodevelopmental Disorders
15 billable codes under F51: none are a CC or MCC; none map to an HCC.
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Instructional notes
Excludes2: not included here, code separately if applicable
- organic sleep disorders (G47.-)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers psychological pain disorders, substance use, abuse, dependence and remission, factitious disorder including Munchausen by proxy, and dementia severity.
- Pain disorders related to psychological factors (page 43)
- Mental and behavioral disorders due to psychoactive substance use (page 43)
- Factitious Disorder (page 44)
- Dementia (page 45)
All codes under F51
F51 can't be used on a claim. Pick a billable code below; grey headings group them.
- F51.0Insomnia not due to a substance or known physiological condition
- F51.01Primary insomnia
- F51.02Adjustment insomnia
- F51.03Paradoxical insomnia
- F51.04Psychophysiologic insomnia
- F51.05Insomnia due to other mental disorder
- F51.09Other insomnia not due to a substance or known physiological condition
- F51.1Hypersomnia not due to a substance or known physiological condition
- F51.11Primary hypersomnia
- F51.12Insufficient sleep syndrome
- F51.13Hypersomnia due to other mental disorder
- F51.19Other hypersomnia not due to a substance or known physiological condition
- F51.3Sleepwalking [somnambulism]
- F51.4Sleep terrors [night terrors]
- F51.5Nightmare disorder
- F51.8Other sleep disorders not due to a substance or known physiological condition
- F51.9Sleep disorder not due to a substance or known physiological condition, unspecified
F51 MS-DRG
As the principal diagnosis, all 15 billable codes under F51 group to MS-DRG 887 (v44.0).
Other codes that refer to F51
Notes on these codes point to F51.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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.
Read more about sleep disorders on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.