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ICD-10 diagnosis code

F51.0 Nonorganic insomnia

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F51.0 is the ICD-10 code for Nonorganic insomnia. 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

A condition of unsatisfactory quantity and/or quality of sleep, which persists for a considerable period of time, including difficulty falling asleep, difficulty staying asleep, or early final wakening. Insomnia is a common symptom of many mental and physical disorders, and should be classified here in addition to the basic disorder only if it dominates the clinical picture.

What F51.0 excludes

Conditions that look similar but belong under another code.

F51.0 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

F51.0Icke-organisk sömnlöshet

NorwayICD-10-NO

F51.0Ikke-organisk insomni

DenmarkICD-10-DK

DF510Ikke-organisk søvnløshed

  • DF5100Søvnløshed UNS
  • DF5101Akut søvnløshed
  • DF5102Paradoks søvnløshed
  • DF5103Psykofysiologisk søvnløshed
  • DF5104Idiopatisk søvnløshed
  • DF5105Søvnløshed betinget af mental sygdom
FinlandICD-10-FI

F51.0Ei-elimellinen unettomuus

GermanyICD-10-GM

F51.0Nichtorganische Insomnie

FranceICD-10-FR

F51.0Insomnie non organique

NetherlandsICD-10-NL

F51.0niet-organische insomnie

United StatesICD-10-CM

Listed through more specific codes:

  • F51.01Primary insomnia
  • F51.02Adjustment insomnia
  • F51.03Paradoxical insomnia
  • F51.04Psychophysiologic insomnia
  • F51.05Insomnia due to other mental disorder
  • F51.09Other insomnia 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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