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

CodeDisplayDefinition
foodFoodAny substance consumed to provide nutritional support for the body.
medicationMedicationSubstances administered to achieve a physiological effect.
environmentEnvironmentAny substances that are encountered in the environment, including any substance not already classified as food, medication, or biologic.
biologicBiologicA preparation that is synthesized from living organisms or their products, especially a human or animal protein, such as a hormone or antitoxin, that is used as a diagnostic, preventive, or therapeutic agent. Examples of biologic medications include: vaccines; allergenic extracts, which are used for both diagnosis and treatment (for example, allergy shots); gene therapies; cellular therapies. There are other biologic products, such as tissues, that are not typically associated with allergies.

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