This code system http://terminology.hl7.org/CodeSystem/immunization-recommendation-status defines the following codes:

CodeDisplayDefinition
due DueThe patient is due for their next vaccination.
overdue OverdueThe patient is considered overdue for their next vaccination.
immune ImmuneThe patient is immune to the target disease and further immunization against the disease is not likely to provide benefit.
contraindicated ContraindicatedThe patient is contraindicated for futher doses.
complete CompleteThe patient is fully protected and no further doses are recommended.
<status value="draft"/><experimental value="false"/><description value="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 status of the patient relative to a recommended dose. This value set is provided as a suggestive example."/><caseSensitive value="true"/><content value="complete"/><concept><code value="due"/><display value="Due"/><definition value="The patient is due for their next vaccination."/></concept><concept><code value="overdue"/><display value="Overdue"/><definition value="The patient is considered overdue for their next vaccination."/></concept><concept><code value="immune"/><display value="Immune"/><definition value="The patient is immune to the target disease and further immunization against the disease is not likely to provide benefit."/></concept><concept><code value="contraindicated"/><display value="Contraindicated"/><definition value="The patient is contraindicated for futher doses."/></concept><concept><code value="complete"/><display value="Complete"/><definition value="The patient is fully protected and no further doses are recommended."/></concept></CodeSystem>