This code system http://www.ama-assn.org/go/cpt defines many codes, but they are not represented here

 <status value="active"/> <experimental value="false"/> <date value="2019-03-20T00:00:00-04:00"/> <publisher value="American Medical Association"/> <contact> <name value="American Medical Association"/> </contact> <description value="American Medical Association's Current Procedure Terminology 4 (CPT-4) codes."/> <content value="not-present"/> </CodeSystem>