R40 is the ICD-10 code for Somnolence, stupor and coma. It is a three-character category divided into 3 subcodes; use the subcode whenever the record supports that level of detail. 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
- Category (3 characters)
- Chapter
- XVIII · R00–R99
- Classification
- WHO ICD-10, 2019 version
What R40 excludes
Conditions that look similar but belong under another code.
Subcodes of R40
R40 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DR40Bevidsthedspåvirkning
- DR403Persisterende vegetativ tilstand
R40Uneliaisuus, horros tai tajuttomuus
R40Somnolenz, Sopor und Koma
R40Somnolence, stupeur et coma
R40somnolentie, stupor en coma
Listed through more specific codes:
- R40.3Persistent vegetative state
- R40.4Transient alteration of awareness
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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