Patient Immunization Data Absent Reason
Context and value of a Data Absent Reason (DAR) indicating why information is missing or not recorded about some or all of a patient's immunizations.
If the DAR applies to the entire immunization class, then only the DAR Code is populated. All other attributes must be left empty.
Other attributes, when present, provide context for the DAR, indicating the specific vaccine or reaction to which the DAR applies.
Appears in
Constraints
Unique key(s)
- Patient, XOR (Vaccine Drug Code, Vaccine Generic Concept Code) if either is specified, Immunization Reaction Code if specified
Stereotype(s)
n/a
Attributes
| Attribute | Type | Multiplicity | Attribute note |
|---|---|---|---|
| Vaccine Drug Code | Codeable Concept | 0..1 | Uniquely specifies a vaccine product (tradename).
Value Set: https://nvc-cnv.canada.ca/en/tradename-immunizing-agents |
| Vaccine Generic Concept Code | Codeable Concept | 0..1 | Uniquely specifies a generic immunization agent (not a vaccine product).
Value Set:
https://nvc-cnv.canada.ca/en/generic-immunizing-agents |
| Immunization Reaction Code | Codeable Concept | 0..1 | Uniquely specifies the type of a reaction to the administration of a vaccine (e.g., rash, fever, anaphylaxis).
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/clinicalfindingcode |
| Immunization Data Absent Reason Code | Codeable Concept | 1 | Uniquely specifies the reason that immunization information is missing or not recorded for a patient (e.g., asked-declined, not-asked, unknown).
Value Set: http://terminology.hl7.org/CodeSystem/data-absent-reason |
Relationships
| From class | From multiplicity | Relationship | To class | To multiplicity |
|---|---|---|---|---|
| Patient Immunization Data Absent Reason | 0..* | has | Clinical Information Life Cycle Event | 0..* |
| Patient Immunization Data Absent Reason | 0..* | for | Patient | 1 |
| Patient Immunization Data Absent Reason | 0..* | documented in | Encounter | 0..1 |
Contact us
If you have questions about this initiative, would like to be added to our stakeholder notification list or would like to participate in our consultations, please email us.
How to cite:
Canadian Institute for Health Information. Patient Immunization Data Absent Reason. Accessed November 02, 2026.
