Medical codes translate documentation into standardized codes that tell payers about the patient's diagnosis, medical necessity, treatments, services, supplies, and any unusual circumstances
InternationalClassification of Diseases, 10th Edition, Clinically Modified - ICD-10-CM
CurrentProcedureTerminology - CPT®
International Classification of Diseases, 10th Edition, Procedural Coding System - ICD-10-PCS
HealthCareProceduralCodingSystem, Level II - HCPCS Level II
Code on DentalProcedures and Nomenclature - CDT®
NationalDrugCodes - NDC
Modifiers - may indicate the status of the patient, the part of the body on which a service is being performed, a payment instruction, an occurrence that changed the service the code describes, or a quality element.
Two federal code sets used to facilitate payment deriving from those above systems are MS-DRG and APCs. They rely on existing codes sets but indicate the resources consumed by the facility to perform the service.