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ICD-10 diagnosis code

R40.2 Coma, unspecified

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R40.2 is the ICD-10 code for Coma, unspecified. 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 R40.2 includes

Conditions and terms that are coded here.

  • Unconsciousness NOS

R40.2 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

R40.2Koma, ospecificerat

NorwayICD-10-NO

R40.2Uspesifisert koma

DenmarkICD-10-DK

DR402Koma UNS

FinlandICD-10-FI

R40.2Määrittämätön kooma

GermanyICD-10-GM

R40.2Koma, nicht näher bezeichnet

FranceICD-10-FR

R40.2Coma, sans précision

  • R40.20État végétatif chronique
  • R40.28Coma, autre et sans précision
NetherlandsICD-10-NL

R40.2coma, niet-gespecificeerd

United StatesICD-10-CM

Listed through more specific codes:

  • R40.20Unspecified coma
  • R40.2ANontraumatic coma due to underlying 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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