F51.1

Non-Billable

ChapterF01–F99

Ranksubcategory

Official Description

Hypersomnia not due to a substance or known physiological condition

Use a more specific code (4 billable)

Metadata & Insights

Excludes2(Not included here. Code separately if applicable.)

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-)

General instructions are available for the parent sections:

BillableHas subcodes

CH5Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

F50-F59Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59)

F51Sleep disorders not due to a substance or known physiological condition

F51.1Hypersomnia not due to a substance or known physiological conditionNot billable

F51.11Primary hypersomniaBillable

F51.12Insufficient sleep syndromeBillable

F51.13Hypersomnia due to other mental disorderBillable

F51.19Other hypersomnia not due to a substance or known physiological conditionBillable

The following parent sections contain instructions or notes that apply to F51.1:

categoryF51

Sleep disorders not due to a substance or known physiological condition

chapterCH5

Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

2026

No direct MS-DRG triggers identified.

Find surgical and procedural codes related to Hypersomnia not due to a substance or known physiological condition.