| identifier | No | Identifier[] | Unique id |
| active | No | boolean | Whether this group’s record is in active use |
| type | Yes | code | person / animal / practitioner / device / medication / substance |
| actual | Yes | boolean | Descriptive or actual |
| code | No | CodeableConcept | Kind of Group members |
| name | No | string | Label for Group |
| quantity | No | unsignedInt | Number of members |
| managingEntity | No | Reference<Organization / RelatedPerson / Practitioner / PractitionerRole> | Entity that is the custodian of the Group’s definition |
| characteristic | No | GroupCharacteristic | Include / Exclude group members by Trait |
| - id | No | string | Unique id for inter-element referencing |
| - extension | No | Extension[] | Additional content defined by implementations |
| - modifierExtension | No | Extension[] | Extensions that cannot be ignored even if unrecognized |
| - code | Yes | CodeableConcept | Kind of characteristic |
| - value[x] | Yes | CodeableConcept, boolean, Quantity, Range, Reference<> | Value held by characteristic |
| - exclude | Yes | boolean | Group includes or excludes |
| - period | No | Period | Period over which characteristic is tested |
| member | No | GroupMember | Who or what is in group |
| - id | No | string | Unique id for inter-element referencing |
| - extension | No | Extension[] | Additional content defined by implementations |
| - modifierExtension | No | Extension[] | Extensions that cannot be ignored even if unrecognized |
| - entity | Yes | Reference<Patient / Practitioner / PractitionerRole / Device / Medication / Substance / Group> | Reference to the group member |
| - period | No | Period | Period member belonged to the group |
| - inactive | No | boolean | If member is no longer in group |
