This is the CodeSystem that contains all the codes in ChargeItemCode (http://terminology.hl7.org/CodeSystem/chargeitem-billingcodes) and ChargeItemCode (http://terminology.hl7.org/CodeSystem/chargeitem-billingcodes). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 209ef897-e0c1-42aa-924c-4a2591583ab9-146
This code system http://hl7.org/fhir/comparison/CodeSystem/209ef897-e0c1-42aa-924c-4a2591583ab9-146 defines codes, but no codes are represented here