Properties
| Name | Required | Type | Description |
|---|---|---|---|
| id | No | string | Unique id for inter-element referencing |
| extension | No | Extension[] | Additional content defined by implementations |
| system | No | uri | Identity of the terminology system |
| version | No | string | Version of the system - if relevant |
| code | No | code | Symbol in syntax defined by the system |
| display | No | string | Representation defined by the system |
| userSelected | No | boolean | If this coding was chosen directly by the user |