| id | 0..1 | string | Logical id of this artifact |
| meta | 0..1 | Meta | Metadata about the resource |
| implicitRules | 0..1 | uri | A set of rules under which this content was created |
| language | 0..1 | code | Language of the resource content |
| text | 0..1 | Narrative | Text summary of the resource, for human interpretation |
| contained | 0..* | Resource | Contained, inline Resources |
| extension | 0..* | Extension | Additional content defined by implementations |
| modifierExtension | 0..* | Extension | Extensions that cannot be ignored |
| identifier | 0..* | Identifier | Business Identifier |
| status | 0..1 | code | active | cancelled | draft | entered-in-error |
| created | 0..1 | dateTime | Creation date |
| insurer | 0..1 | Reference | Target |
| provider | 0..1 | Reference | Responsible practitioner |
| candidate | 0..1 | Reference | The subject to be enrolled |
| coverage | 0..1 | Reference | Insurance information |