R40.0 is the ICD-10 code for Somnolence. It is a four-character subcategory of R40 (Somnolence, stupor and coma), the most specific level in the WHO edition. It belongs to the block R40–R46 (Symptoms and signs involving cognition, perception, emotional state and behaviour) in Chapter XVIII, Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
- Code type
- Subcategory (4 characters)
- Chapter
- XVIII · R00–R99
- Classification
- WHO ICD-10, 2019 version
What R40.0 includes
Conditions and terms that are coded here.
- Drowsiness
R40.0 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
R40.0Somnolens
R40.0Somnolens
DR400Somnolens
R40.0Uneliaisuus
R40.0Somnolenz
R40.0Somnolence
R40.0somnolentie
R40.0Somnolence
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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