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ICD-10 diagnosis code

B27.1 Cytomegaloviral mononucleosis

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B27.1 is the ICD-10 code for Cytomegaloviral mononucleosis. It is a four-character subcategory of B27 (Infectious mononucleosis), the most specific level in the WHO edition. It belongs to the block B25–B34 (Other viral diseases) in Chapter I, Certain infectious and parasitic diseases.

Code type
Subcategory (4 characters)
Chapter
I · A00–B99
Classification
WHO ICD-10, 2019 version

B27.1 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

B27.1Mononukleos orsakad av cytomegalvirus

NorwayICD-10-NO

B27.1Cytomegalovirusmononukleose

DenmarkICD-10-DK

DB271Mononukleose forårsaget af cytomegalovirus

FinlandICD-10-FI

B27.1Sytomegaloviruksen aiheuttama mononukleoosi

GermanyICD-10-GM

B27.1Mononukleose durch Zytomegalieviren

FranceICD-10-FR

B27.1Mononucléose à cytomégalovirus

NetherlandsICD-10-NL

B27.1mononucleosis door cytomegalovirus

United StatesICD-10-CM

Listed through more specific codes:

  • B27.10Cytomegaloviral mononucleosis without complications
  • B27.11Cytomegaloviral mononucleosis with polyneuropathy
  • B27.12Cytomegaloviral mononucleosis with meningitis
  • B27.19Cytomegaloviral mononucleosis with other complication

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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