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Table 1 Anaphylaxis classification and coding in ICD-10 and in ICD-11

From: Critical view of anaphylaxis epidemiology: open questions and new perspectives

Anaphylaxis ICD-10 codes (2016 version)

Anaphylaxis ICD-11 codes (November 2016 version)

Chapter XIX injury, poisoning and certain other consequences of external causes (S00–T98)

Chapter 04 disorders of the immune system

Other and unspecified effects of external causes (T66–T78)

Section allergic and hypersensitivity conditions

T78 Adverse effects, not elsewhere classified

Note: This category is to be used as the primary code to identify the effects, not elsewhere classifiable, of unknown, undetermined or ill-defined causes. For multiple coding purposes this category may be used as an additional code to identify the effects of conditions classified elsewhere

Subsection anaphylaxis

 T78.0 Anaphylactic shock due to adverse food reaction

4B50 Anaphylaxis due to allergic reaction to food

 T78.1 Other adverse food reactions, not elsewhere classified

4B51 Drug-induced anaphylaxis

 T78.2 Anaphylactic shock, unspecified

4B52 Anaphylaxis due to insect venom

  Allergic shock

NOS

4B53 Anaphylaxis provoked by physical factors

  Anaphylactic reaction

    4B53.1 Exercise-induced anaphylaxis

  Anaphylaxis

    4B53.2 Cold-induced anaphylaxis

 T78.3 Angioneurotic oedema

    4B53.Y Anaphylaxis provoked by other specified physical factors

  Giant urticaria

    4B53.Z Anaphylaxis provoked by unspecified physical factors

  Quincke oedema

4B54 Anaphylaxis due to inhaled allergens

 T78.4 Allergy, unspecified

4B55 Anaphylaxis due to contact with allergens

4B56 Anaphylaxis secondary to mast cell disorder

  Allergic reaction NOS

 

  Hypersensitivity NOS

4B5Y Other specified anaphylaxis

  Idiosyncracy NOS

 

 T78.8 Other adverse effects, not elsewhere classified

4B5Z Anaphylaxis, unspecified

 T78.9 Adverse effect, unspecified