Is F51.1 a billable ICD-10-CM code?

No. F51.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does F51.1 sit in the tabular list?

Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59).

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

Also inherited, and the opposite of Excludes1: these conditions are not part of F51.1, but a patient can have both, so you may code both.

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

organic sleep disorders (G47.-)

Risk adjustment

F51.1 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code history

F51.1 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead F51.1

4 child codes. Green means billable.

Related codes at this level

Codes that share F51. If F51.1 is not quite right, the correct code is usually one of these.

Questions about F51.1

Is F51.1 a billable ICD-10-CM code?: No. F51.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does F51.1 sit in the tabular list?: Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59).