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| Package | Version | Identity | Name/Title | Status | FMM | WG | Date | Auth | DataType | Usage # |
|---|---|---|---|---|---|---|---|---|---|---|
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Patient.con.period.json | STU3: period additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Patient.con.telecom.json | STU3: telecom additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Patient.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Patient.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Patient.name.json | STU3: name additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Patient.photo.json | STU3: photo additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Patient.telecom.json | STU3: telecom additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Patient.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PaymentNotice.identifier.json | STU3: Business Identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PaymentNotice.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PaymentNotice.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-PR.det.request.json | STU3: Claim (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PaymentReconciliation.identifier.json | STU3: Business Identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PaymentReconciliation.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PaymentReconciliation.outcome.json | STU3: complete | error | partial additional types additional codes | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PaymentReconciliation.period.json | STU3: period additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PaymentReconciliation.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Person.address.json | STU3: address additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Person.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Person.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Person.name.json | STU3: name additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Person.photo.json | STU3: photo additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Person.telecom.json | STU3: telecom additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Person.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.act.documentation.json | STU3: documentation additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.act.input.json | STU3: input additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.act.output.json | STU3: output additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.act.rel.offset.json | STU3: offset additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.act.timing.json | STU3: timing additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.act.triggerDefinition.json | STU3: triggerDefinition additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.contact.json | STU3: contact additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.contributor.json | STU3: A content contributor (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.effectivePeriod.json | STU3: effectivePeriod additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.goa.documentation.json | STU3: documentation additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.goa.tar.detail.json | STU3: detail additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.relatedArtifact.json | STU3: Related artifacts for the asset additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PlanDefinition.useContext.json | STU3: Context the content is intended to support additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Practitioner.address.json | STU3: address additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Practitioner.identifier.json | STU3: A identifier for the person as this agent additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Practitioner.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Practitioner.name.json | STU3: name additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Practitioner.photo.json | STU3: photo additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Practitioner.qua.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Practitioner.qua.period.json | STU3: period additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Practitioner.telecom.json | STU3: telecom additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Practitioner.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-PractitionerRole.availabilityExceptions.json | STU3: Description of availability exceptions (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-PractitionerRole.ava.allDay.json | STU3: Always available? e.g. 24 hour service additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-PractitionerRole.ava.availableEndTime.json | STU3: Closing time of day (ignored if allDay = true) additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-PractitionerRole.ava.availableStartTime.json | STU3: Opening time of day (ignored if allDay = true) additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-PractitionerRole.ava.daysOfWeek.json | STU3: mon | tue | wed | thu | fri | sat | sun additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PractitionerRole.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PractitionerRole.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-PractitionerRole.not.description.json | STU3: Reason presented to the user explaining why time not available additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PractitionerRole.not.during.json | STU3: Service not availablefrom this date additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PractitionerRole.period.json | STU3: period additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PractitionerRole.telecom.json | STU3: telecom additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-PractitionerRole.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Procedure.complicationDetail.json | STU3: A condition that is a result of the procedure (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Procedure.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Procedure.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Procedure.notDone.json | STU3: True if procedure was not performed as scheduled (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Procedure.note.json | STU3: note additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Procedure.performed.json | STU3: Date/Period the procedure was performed (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Procedure.reasonReference.json | STU3: Condition that is the reason the procedure performed additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Procedure.status.json | STU3: preparation | in-progress | suspended | aborted | completed | entered-in-error | unknown additional codes | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Procedure.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Procedure.usedReference.json | STU3: usedReference additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcedureRequest.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcedureRequest.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcedureRequest.note.json | STU3: note additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcedureRequest.occurrence.json | STU3: When procedure should occur additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-ProcedureRequest.reasonReference.json | STU3: Explanation/Justification for test additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcedureRequest.req.onBehalfOf.json | STU3: Organization agent is acting for (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcedureRequest.requisition.json | STU3: requisition additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-ProcedureRequest.supportingInfo.json | STU3: supportingInfo additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcedureRequest.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcessRequest.identifier.json | STU3: Business Identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcessRequest.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcessRequest.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcessResponse.identifier.json | STU3: Business Identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcessResponse.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ProcessResponse.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Provenance.age.relatedAgentType.json | STU3: Type of relationship between agents (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Provenance.ent.role.json | STU3: derivation | revision | quotation | source | removal | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Provenance.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Provenance.signature.json | STU3: signature additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Provenance.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Questionnaire.contact.json | STU3: contact additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Questionnaire.effectivePeriod.json | STU3: effectivePeriod additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Questionnaire.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Questionnaire.ite.ena.answer.json | STU3: Value question must have additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Questionnaire.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Questionnaire.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Questionnaire.useContext.json | STU3: Context the content is intended to support additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-QuestionnaireResponse.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-QR.ite.ans.value.json | STU3: value additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-QuestionnaireResponse.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-QuestionnaireResponse.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Reference.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ReferralRequest.groupIdentifier.json | STU3: Composite request this is part of additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ReferralRequest.identifier.json | STU3: Business identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ReferralRequest.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ReferralRequest.note.json | STU3: Comments made about referral request additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-ReferralRequest.reasonReference.json | STU3: Why is service needed? additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ReferralRequest.req.onBehalfOf.json | STU3: Organization agent is acting for (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-ReferralRequest.supportingInfo.json | STU3: Additonal information to support referral or transfer of care request additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ReferralRequest.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RelatedArtifact.document.json | STU3: document additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-RelatedArtifact.url.json | STU3: Where the artifact can be accessed (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RelatedPerson.address.json | STU3: address additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RelatedPerson.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RelatedPerson.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RelatedPerson.name.json | STU3: name additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RelatedPerson.period.json | STU3: period additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RelatedPerson.photo.json | STU3: photo additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RelatedPerson.telecom.json | STU3: telecom additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RelatedPerson.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RequestGroup.act.documentation.json | STU3: documentation additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RequestGroup.act.rel.offset.json | STU3: offset additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RequestGroup.act.timing.json | STU3: timing additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RequestGroup.definition.json | STU3: Instantiates protocol or definition (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 5 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RequestGroup.groupIdentifier.json | STU3: groupIdentifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RequestGroup.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RequestGroup.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RequestGroup.note.json | STU3: note additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RequestGroup.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-ResearchStudy.category.json | STU3: Classifications for the study (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchStudy.contact.json | STU3: contact additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-ResearchStudy.enrollment.json | STU3: Inclusion & exclusion criteria (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchStudy.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchStudy.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchStudy.note.json | STU3: Comments made about the event additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchStudy.period.json | STU3: period additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-ResearchStudy.principalInvestigator.json | STU3: The individual responsible for the study (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-ResearchStudy.reasonStopped.json | STU3: Reason for terminating study early (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchStudy.relatedArtifact.json | STU3: relatedArtifact additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-ResearchStudy.sponsor.json | STU3: Organization responsible for the study (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-ResearchStudy.status.json | STU3: draft | in-progress | suspended | stopped | completed | entered-in-error additional codes | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchStudy.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchSubject.identifier.json | STU3: Business Identifier for research subject additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchSubject.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchSubject.period.json | STU3: period additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ResearchSubject.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Resource.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RiskAssessment.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RiskAssessment.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RiskAssessment.pre.probability.json | STU3: probability additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RiskAssessment.pre.when.json | STU3: when additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-RiskAssessment.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-SampledData.period.json | STU3: Number of milliseconds between samples additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Schedule.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Schedule.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Schedule.planningHorizon.json | STU3: The period of time that the slots that are attached to this Schedule resource cover (even if none exist). These cover the amount of time that an organization's planning horizon; the interval for which they are currently accepting appointments. This does not define a "template" for planning outside these dates additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Schedule.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-SearchParameter.contact.json | STU3: contact additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-SearchParameter.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-SearchParameter.modifier.json | STU3: missing | exact | contains | not | text | in | not-in | below | above | type additional codes | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-SearchParameter.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-SearchParameter.useContext.json | STU3: Context the content is intended to support additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-SearchParameter.xpathUsage.json | STU3: normal | phonetic | nearby | distance | other additional codes | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-SearchParameter.xpath.json | STU3: XPath that extracts the values (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.coordinateSystem.json | STU3: Base number of coordinate system (0 for 0-based numbering or coordinates, inclusive start, exclusive end, 1 for 1-based numbering, inclusive start, inclusive end) (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Sequence.identifier.json | STU3: identifier additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Sequence.meta.json | STU3: meta additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.observedSeq.json | STU3: Sequence that was observed (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.quality.json | STU3: An set of value as quality of sequence (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.quantity.json | STU3: The number of copies of the seqeunce of interest. (RNASeq) (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.readCoverage.json | STU3: Average number of reads representing a given nucleotide in the reconstructed sequence (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.ref.genomeBuild.json | STU3: The Genome Build used for reference, following GRCh build versions e.g. 'GRCh 37' (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.ref.referenceSeqId.json | STU3: Reference identifier (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.ref.referenceSeqString.json | STU3: A string to represent reference sequence (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Sequence.ref.strand.json | STU3: Directionality of DNA ( +1/-1) additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.ref.windowEnd.json | STU3: End position of the window on the reference sequence (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.ref.windowStart.json | STU3: Start position of the window on the reference sequence (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.repository.json | STU3: External repository which contains detailed report related with observedSeq in this resource (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-Sequence.text.json | STU3: text additional types | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 3 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.var.cigar.json | STU3: Extended CIGAR string for aligning the sequence with reference bases (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.var.end.json | STU3: End position of the variant on the reference sequence (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.var.start.json | STU3: Start position of the variant on the reference sequence (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r5 | R5 | StructureDefinition-ext-R3-Sequence.var.variantPointer.json | STU3: Pointer to observed variant information (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 1 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.approvalDate.json | STU3: When the service definition was approved by publisher (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.contact.json | STU3: Contact details for the publisher (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.contributor.json | STU3: A content contributor (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.copyright.json | STU3: Use and/or publishing restrictions (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.dataRequirement.json | STU3: What data is used by the module (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.date.json | STU3: Date this was last changed (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.description.json | STU3: Natural language description of the service definition (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.effectivePeriod.json | STU3: When the service definition is expected to be used (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.experimental.json | STU3: For testing purposes, not real usage (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.jurisdiction.json | STU3: Intended jurisdiction for service definition (if applicable) (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.lastReviewDate.json | STU3: When the service definition was last reviewed (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.name.json | STU3: Name for this service definition (computer friendly) (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.operationDefinition.json | STU3: Operation to invoke (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.publisher.json | STU3: Name of the publisher (organization or individual) (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.purpose.json | STU3: Why this service definition is defined (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |
| hl7.fhir.uv.xver-r3.r4b | R4B | StructureDefinition-ext-R3-ServiceDefinition.relatedArtifact.json | STU3: Additional documentation, citations, etc (new) | trial-use | 0 | fhir | 2026-03 | hl7 | Extension | 4 |