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

# FHIR FHIRPath Function: %terminologies.lookup

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

`%terminologies.lookup(coded, params) : Parameters`

This calls the [Terminology Service $lookup](terminology-service#lookup) operation ([formal definition](codesystem-operation-lookup)).

Parameters:

-   **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 lookup operation (e.g., 'date=2011-03-04&displayLanguage=en')

**Return Value:**

* * *

[Back to FHIR FHIRPath](/fhir-fhirpath)