Union of http://terminology.hl7.org/CodeSystem/substance-category and http://terminology.hl7.org/CodeSystem/substance-category

This is the CodeSystem that contains all the codes in Substance Category Codes (http://terminology.hl7.org/CodeSystem/substance-category) and Substance Category Codes (http://terminology.hl7.org/CodeSystem/substance-category). E.g. what you have to deal with if you get resources containing codes in either of them

CodeSystem

Generated Narrative: CodeSystem 974a4042-5ef9-4d87-bcaa-92de671fa085-803

This code system http://hl7.org/fhir/comparison/CodeSystem/974a4042-5ef9-4d87-bcaa-92de671fa085-803 defines codes, but no codes are represented here

CodeDisplayDefinition
allergen AllergenA substance that causes an allergic reaction.
biological Biological SubstanceA substance that is produced by or extracted from a biological source.
body Body SubstanceA substance that comes directly from a human or an animal (e.g. blood, urine, feces, tears, etc.).
chemical ChemicalAny organic or inorganic substance of a particular molecular identity, including -- (i) any combination of such substances occurring in whole or in part as a result of a chemical reaction or occurring in nature and (ii) any element or uncombined radical (http://www.epa.gov/opptintr/import-export/pubs/importguide.pdf).
food Dietary SubstanceA food, dietary ingredient, or dietary supplement for human or animal.
drug Drug or MedicamentA substance intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease in man or other animals (Federal Food Drug and Cosmetic Act).
material MaterialA finished product which is not normally ingested, absorbed or injected (e.g. steel, iron, wood, plastic and paper).