Alphabetic Index FY2027

F51

Sleep disorders not due to a substance or known physiological condition

FY2027Chapter 5: Mental, Behavioral and Neurodevelopmental disorders/F50–F59 Behavioral syndromes associated with physiological disturbances and physical factors

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

F51 is a non-billable ICD-10-CM code category for sleep disorders not due to a substance or known physiological condition. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are F51.0 Insomnia not due to a substance or known physiological condition, F51.1 Hypersomnia not due to a substance or known physiological condition, F51.3 Sleepwalking [somnambulism], F51.4 Sleep terrors [night terrors] and 3 more. Its coding notes include 2 Excludes2 entries.

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

This code
  • organic sleep disorders (G47.-)
Also from chapter/block level (1 note)
Inherited from Chapter 5 Mental, Behavioral and Neurodevelopmental disorders
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Includes

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

Also from chapter/block level (1 note)
Inherited from Chapter 5 Mental, Behavioral and Neurodevelopmental disorders
  • disorders of psychological development

More specific codes under F51 7