B27.9 is the ICD-10 code for Infectious mononucleosis, unspecified. 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
B27.9 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
B27.9Uspesifisert mononukleose
DB279Mononukleose UNS
B27.9Määrittämätön (tarttuva) mononukleoosi
B27.9Infektiöse Mononukleose, nicht näher bezeichnet
B27.9Mononucléose infectieuse, sans précision
B27.9mononucleosis infectiosa, niet-gespecificeerd
Listed through more specific codes:
- B27.90Infectious mononucleosis, unspecified without complication
- B27.91Infectious mononucleosis, unspecified with polyneuropathy
- B27.92Infectious mononucleosis, unspecified with meningitis
- B27.99Infectious mononucleosis, unspecified 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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