HL7 Terminology (THO)
7.2.0 - Publication International flag

This page is part of the HL7 Terminology (v7.2.0: Release) based on FHIR (HL7® FHIR® Standard) v5.0.0. This is the current published version. For a full list of available versions, see the Directory of published versions

CodeSystem: Evidence Variable Constraint

Official URL: http://terminology.hl7.org/CodeSystem/evidence-variable-constraint Version: 1.0.0
Active as of 2026-05-04 Maturity Level: 1 Responsible: HL7 (FHIR Project) Computable Name: EvidenceVariableConstraint

A rule or other expectation for data values.

This Code system is referenced in the definition of the following value sets:

This case-sensitive code system http://terminology.hl7.org/CodeSystem/evidence-variable-constraint defines the following codes:

CodeDisplayDefinition
alphanumeric-only Alphanumeric Characters Only String values that are restricted to only numbers and letters [A-Za-z0-9].
alphanumeric-space-only Alphanumeric and Space Characters Only String values that are restricted to only numbers, letters, and spaces [A-Za-z0-9\s].
range-zero-to-one Range Zero to One Numeric value between 0 and 1, inclusive.

Description of the above table(s).