| # | | Name | Source | Ver | Description |
| 1 | | encounter class | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The class of encounter (inpatient, outpatient, etc.). |
| 2 | | Encounter type | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The type of the encounter. |
| 3 | | Episode of care | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Identifies the episode(s) of care that this resource is relevant to. Establishes the EpisodeOfCare as a 'grouper' of resources that are relevant to that episode. |
| 4 | | Event Encounter | hl7.fhir.us.qicore#current | R4 | Specifies the encounter associated with an event resource. |
| 5 | | Event Occurrence | hl7.fhir.us.qicore#current | R4 | Specifies when an event occurred. |
| 6 | | Event Status | hl7.fhir.us.qicore#current | R4 | Specifies the status of an event resource. |
| 7 | | Event Subject | hl7.fhir.us.qicore#current | R4 | Specifies the subject of an event resource. |
| 8 | | Initiating organization | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The organization initiating the request. |
| 9 | | initiating person | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The person initiating the request. |
| 10 | | Receiving organization | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The organization that will receive the response. |
| 11 | | Receiving person | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The person in the receiving organization that will receive the response. |
| 12 | | Recipient language | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Preferred language of the person that will consume the content. |
| 13 | | Recipient type | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The type of individual that will consume the response content. This may be different from the requesting user type (e.g. if a clinician is getting disease management guidance for provision to a patient). E.g. patient, healthcare provider or specific type of healthcare provider (physician, nurse, etc.). |
| 14 | | System user language | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Preferred language of the person using the system. |
| 15 | | System user task context | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The task the system user is performing, e.g. laboratory results review, medication list review, etc. This information can be used to tailor decision support outputs, such as recommended information resources. |
| 16 | | System user type | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The type of user initiating the request, e.g. patient, healthcare provider, or specific type of healthcare provider (physician, nurse, etc.). |