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ICD-10 diagnosis code

T78.9 Adverse effect, unspecified

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T78.9 is the ICD-10 code for Adverse effect, unspecified. It is a four-character subcategory of T78 (Adverse effects, not elsewhere classified), the most specific level in the WHO edition. It belongs to the block T66–T78 (Other and unspecified effects of external causes) in Chapter XIX, Injury, poisoning and certain other consequences of external causes.

Code type
Subcategory (4 characters)
Chapter
XIX · S00–T98
Classification
WHO ICD-10, 2019 version

What T78.9 excludes

Conditions that look similar but belong under another code.

  • adverse effect of surgical and medical care NOS T88.9
  • unspecified effects of external causes T76

T78.9 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

T78.9Ogynnsam effekt, ospecificerad

NorwayICD-10-NO

T78.9Uspesifisert skadevirkning

DenmarkICD-10-DK

DT789Bivirkning UNS

FinlandICD-10-FI

T78.9Määrittämätön epäedullinen vaikutus

GermanyICD-10-GM

T78.9Unerwünschte Nebenwirkung, nicht näher bezeichnet

FranceICD-10-FR

T78.9Effet indésirable, sans précision

NetherlandsICD-10-NL

T78.9ongewenst gevolg, niet-gespecificeerd

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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