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 towards perceived immunity against a vaccine preventable disease. This value set is provided as a suggestive example.
This code system http://hl7.org/fhir/immunization-recommendation-status defines the following codes:
| Code | Display | Definition |
| due | Due | The patient is due for their next vaccination. |
| overdue | Overdue | The patient is considered overdue for their next vaccination. |