Integrated Campaign Registry (ICR) Implementation Guide
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CodeSystem: ICR Adverse Event Causality

Official URL: https://icr.healthcampaigns.org/CodeSystem/icr-adverse-event-causality-cs Version: 0.1.0
Draft as of 2026-08-07 Computable Name: ICRAdverseEventCausalityCS

WHO/CIOMS causality classification of an adverse event following an intervention — intervention-neutral: covers AEFI (immunization) and MDA drug pharmacovigilance alike. Top-level WHO categories; immunization implementations may use WHO IMMZ.AdverseEvent's finer A1–A4 subtypes (espen-v3 / §17.2 C1).

This Code system is referenced in the content logical definition of the following value sets:

This case-sensitive code system https://icr.healthcampaigns.org/CodeSystem/icr-adverse-event-causality-cs defines the following codes:

CodeDisplayDefinition
a-consistent A — Consistent causal association Consistent causal association to the intervention (WHO category A; immunization subtypes A1 product, A2 quality defect, A3 administration error, A4 anxiety).
b-indeterminate B — Indeterminate Indeterminate: conflicting trends or insufficient evidence.
c-coincidental C — Coincidental / inconsistent Inconsistent causal association — coincidental, due to underlying/emerging condition or other exposure.
d-unclassifiable D — Unclassifiable Unclassifiable: insufficient information to assess.