This is the CodeSystem that contains codes in both ChargeItemCode (http://terminology.hl7.org/CodeSystem/chargeitem-billingcodes) and ChargeItemCode (http://terminology.hl7.org/CodeSystem/chargeitem-billingcodes).
Generated Narrative: CodeSystem d1c8b6ec-a80e-4fac-a75a-4c2360d0fb6d-660
This code system http://hl7.org/fhir/comparison/CodeSystem/d1c8b6ec-a80e-4fac-a75a-4c2360d0fb6d-660 defines codes, but no codes are represented here