Union of http://terminology.hl7.org/CodeSystem/expansion-processing-rule and http://terminology.hl7.org/CodeSystem/expansion-processing-rule

This is the CodeSystem that contains all the codes in ExpansionProcessingRule (http://terminology.hl7.org/CodeSystem/expansion-processing-rule) and ExpansionProcessingRule (http://terminology.hl7.org/CodeSystem/expansion-processing-rule). E.g. what you have to deal with if you get resources containing codes in either of them

CodeSystem

Generated Narrative: CodeSystem ad63b62d-52f3-4c4a-8fee-31e713b8e7dc-437

This code system http://hl7.org/fhir/comparison/CodeSystem/ad63b62d-52f3-4c4a-8fee-31e713b8e7dc-437 defines codes, but no codes are represented here

CodeDisplayDefinition
all-codes All Codes

The expansion (when in UI mode) includes all codes and any defined groups (in extensions).

ungrouped Groups + Ungrouped codes

The expanion (when in UI mode) lists the groups, and then any codes that have not been included in a group.

groups-only Groups Only

The expansion (when in UI mode) only includes the defined groups.