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

# FHIR FHIRPath Function: %terminologies.subsumes

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

`%terminologies.subsumes(system, coded1, coded2, params) : code`

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

Parameters:

-   **system**: the URI of a code system within which the subsumption testing occurs
-   **coded1**: A [Coding](datatypes#coding) or a resource element that is a [code](datatypes#code)
-   **coded2**: A [Coding](datatypes#coding) 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., 'version=2014-05-06')

**Return Value:** a code as specified for the subsumes operation.

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