---
type: "fhir-fhirpath-function"
title: "FHIR FHIRPath Function: %terminologies.validateVS"
source: "source/fhirpath.html"
---

# FHIR FHIRPath Function: %terminologies.validateVS

This page is part of **FHIR FHIRPath** (FHIR-specific extensions). Base spec lives at [FHIRPath](/fhirpath).

`%terminologies.validateVS(valueSet, coded, params) : Parameters`

This calls the [Terminology Service $validate-code](terminology-service#expand) operation on a value set ([formal definition](valueset-operation-validate-code)).

Parameters:

-   **valueSet**: either an actual [ValueSet](valueset), or a [canonical URL](references#canonical) reference to a value set.
-   **coded**: either a [Coding](datatypes#coding), a [CodeableConcept](datatypes#CodeableConcept), or a resource element that is a [code](datatypes#code)
-   **params**: a URL encoded string with other parameters for the validate-code operation (e.g., 'date=2011-03-04&displayLanguage=en')

**Return Value:** A [Parameters](parameters) resource with the results of the validation operation.

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