This is the ValueSet that contains all the codes in US Core Medication Codes (RxNorm) (http://hl7.org/fhir/us/core/ValueSet/us-core-medication-codes) and Medication Clinical Drug (http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113762.1.4.1010.4). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: ValueSet e58c1cb3-1a1b-4d98-8d1d-fb0893398be0-122
This value set includes codes based on the following rules:
http://www.nlm.nih.gov/research/umls/rxnorm where TTY in SCD,SBD,GPCK,BPCK,SCDG,SBDG,SCDF,SBDF