Release 5 Draft Ballot

This is the Continuous Integration Build of FHIR (will be incorrect/inconsistent at times).
See the Directory of published versions Code System

Clinical Decision Support Work Group Maturity Level: 0Trial Use Use Context: Any

This is a code system defined by the FHIR project.


Defining URL:

Commonly used classifiers for evidence sets.

Committee:Clinical Decision Support Work Group
OID:2.16.840.1.113883.4.642.1.0 (for OID based terminology systems)
Source ResourceXML / JSON

This Code system is used in the following value sets:

This code system defines the following codes:

Code Display Definition
COVID19Specific COVID-19 specific article About COVID-19.
COVID19Relevant COVID-19 relevant (but not specific) article Not about COVID-19 but relevant to COVID-19 management or understanding.
COVID19HumanResearch COVID-19 human data in population, exposure, or outcome contains human COVID-19 disease in the research data as any variable (population, exposure or outcome).
OriginalResearch Article includes original research such as randomized trial, observational study.
ResearchSynthesis Article includes synthesis of research such as systematic review, meta-analysis, rapid review.
Guideline Article includes guideline for clinical practice guidelines.
ResearchProtocol Article provides protocol without results for research protocols.
NotResearchNotGuideline Article is neither research nor guideline for things that are not research reports, research protocols or guidelines.
Treatment Article about treatment about therapeutic interventions.
PreventionAndControl Article about prevention and control about preventive care and interventions.
Diagnosis Article about diagnosis about methods to distinguish having or not having a condition.
PrognosisPrediction Article about prognosis or prediction about predicting risk for something or risk factors for it.
RatedAsYes Rated as yes, affirmative, positive, present, or include
RatedAsNo Rated as no, negative, absent, or exclude Rated as no, negative, absent, or exclude.
NotAssessed Not rated, not assessed Neither rated as yes nor rated as no.
RatedAsRCT classified as randomized controlled trial classified as randomized controlled trial.
RatedAsControlledTrial classified as nonrandomized controlled trial (experimental) classified as nonrandomized controlled trial (experimental).
RatedAsComparativeCohort classified as comparative cohort study (observational) classified as comparative cohort study (observational).
RatedAsCaseControl classified as case-control study classified as case-control study.
RatedAsUncontrolledSeries classified as uncontrolled cohort (case series) classified as uncontrolled cohort (case series).
RatedAsMixedMethods classified as mixed-methods study classified as mixed-methods study.
RatedAsOther classified as other concept (not elsewhere classified) classified as other concept (not elsewhere classified).
RiskOfBias Risk of bias assessment Risk of bias assessment.
NoBlinding No blinding No blinding.
AllocConcealNotStated Allocation concealment not stated Allocation concealment not stated.
EarlyTrialTermination Early trial termination Early trial termination.
NoITT No intention-to-treat analysis No intention-to-treat analysis.
Preprint Preprint (not final publication) Results presented in preprint (pre-final publication) form.
PreliminaryAnalysis Preliminary analysis Preliminary analysis.
BaselineImbalance Baseline imbalances Differences between groups at start of trial may confound or bias the findings.
SubgroupAnalysis Subgroup analysis Subgroup analysis.


See the full registry of code systems defined as part of FHIR.

Explanation of the columns that may appear on this page:

LevelA few code lists that FHIR defines are hierarchical - each code is assigned a level. See Code System for further information.
SourceThe source of the definition of the code (when the value set draws in codes defined elsewhere)
CodeThe code (used as the code in the resource instance). If the code is in italics, this indicates that the code is not selectable ('Abstract')
DisplayThe display (used in the display element of a Coding). If there is no display, implementers should not simply display the code, but map the concept into their application
DefinitionAn explanation of the meaning of the concept
CommentsAdditional notes about how to use the code