F51.1
Hypersomnia not due to a substance or known physiological condition
Non-billable headerNot valid on its own. Use one of the more specific codes under it.
F51.1 is a non-billable ICD-10-CM code header for hypersomnia 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 F51.11 Primary hypersomnia, F51.12 Insufficient sleep syndrome, F51.13 Hypersomnia due to other mental disorder and F51.19 Other hypersomnia not due to a substance or known physiological condition. Its coding notes include 8 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
This code
- alcohol related hypersomnia (F10.182, F10.282, F10.982)
- drug-related hypersomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
- hypersomnia NOS (G47.10)
- hypersomnia due to known physiological condition (G47.10)
- idiopathic hypersomnia (G47.11, G47.12)
- narcolepsy (G47.4-)
Inherited from F51 Sleep disorders not due to a substance or known physiological condition
- 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