Code systems

Custom code systems used in the COVID-19 assessment questionnaire, represented as CodeSystem FHIR resources.

Code systems define sets of standard codes for concept from a particular area, for example, for symptoms or specific laboratory tests. They are sometimes also referred to as ontologies, terminologies, or enumerations. This implementation guide uses standard code systems (like for instance LOINC) whenever possible. The code systems listed here are custom code systems that cover cases where no standardized codes are available.