F51.1

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

Non-billable headerICD-10-CM

F51.1 is a non-billable header ICD-10-CM code for hypersomnia not due to a substance or known physiological condition. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2: not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

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-)

Excludes2 inherited from the categories above F51.1

Not part of this code, but both may be coded when both are present.

Written on F51: Sleep disorders not due to a substance or known physiological condition

organic sleep disorders (G47.-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead F51.1

4 child codes. Green means billable.