http://terminology.hl7.org/CodeSystem/immunization-evaluation-dose-status-reason|4.0.1

Immunization Evaluation Dose Status Reason codes

The value set to instantiate this attribute should be drawn from a terminologically robust code system that consists of or contains concepts to support describing the reason why an administered dose has been assigned a particular status. Often, this reason describes why a dose is considered invalid. This value set is provided as a suggestive example.