This is the ValueSet that contains all the codes in Therapeutic Response to Medication (http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.10.20.15.2.5.12) and Therapeutic Response to Medication (http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.10.20.15.2.5.12). E.g. what you have to deal with if you get resources containing codes in either of them