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ICD-10 diagnosis code

F51.1 Nonorganic hypersomnia

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F51.1 is the ICD-10 code for Nonorganic hypersomnia. It is a four-character subcategory of F51 (Nonorganic sleep disorders), the most specific level in the WHO edition. It belongs to the block F50–F59 (Behavioural syndromes associated with physiological disturbances and physical factors) in Chapter V, Mental and behavioural disorders.

Code type
Subcategory (4 characters)
Chapter
V · F00–F99
Classification
WHO ICD-10, 2019 version

Definition

Hypersomnia is defined as a condition of either excessive daytime sleepiness and sleep attacks (not accounted for by an inadequate amount of sleep) or prolonged transition to the fully aroused state upon awakening. In the absence of an organic factor for the occurrence of hypersomnia, this condition is usually associated with mental disorders.

What F51.1 excludes

Conditions that look similar but belong under another code.

F51.1 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

F51.1Icke-organisk hypersomni

NorwayICD-10-NO

F51.1Ikke-organisk hypersomni

DenmarkICD-10-DK

DF511Ikke-organisk øget søvntrang

  • DF5110Hypersomni uden kendt årsag
  • DF5111Adfærdsbetinget utilstrækkelig søvn
FinlandICD-10-FI

F51.1Ei-elimellinen liikaunisuus

GermanyICD-10-GM

F51.1Nichtorganische Hypersomnie

FranceICD-10-FR

F51.1Hypersomnie non organique

NetherlandsICD-10-NL

F51.1niet-organische hypersomnia

United StatesICD-10-CM

Listed through more specific codes:

  • F51.11Primary hypersomnia
  • F51.12Insufficient sleep syndrome
  • F51.13Hypersomnia due to other mental disorder
  • F51.19Other hypersomnia not due to a substance or known physiological condition

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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