Substance Category Codes

This code system http://hl7.org/fhir/substance-category defines the following codes:

Code	Display	Definition
allergen	Allergen	A substance that causes an allergic reaction.
biological	Biological Substance	A substance that is produced by or extracted from a biological source.
body	Body Substance	A substance that comes directly from a human or an animal (e.g. blood, urine, feces, tears, etc.).
chemical	Chemical	Any 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 Substance	A food, dietary ingredient, or dietary supplement for human or animal.
drug	Drug or Medicament	A 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	Material	A finished product which is not normally ingested, absorbed or injected (e.g. steel, iron, wood, plastic and paper).